The authorized source of trusted medical research and education for the Chinese-language medical community. Now, we can use all the functions of the dplyr package in our case group_by and summarise_at: iris %>% # Specify data frame Missing values can be imputed with a provided constant value, or using the statistics (mean, median or most frequent) of each column in which the missing values are located. Do not freeze. Thank you for the comment and the kind words! The median (Q1, Q3) percent change in LDL-C from baseline to Week 80 was 14% (41, 4). In this case you can either use the steps I have explained in (I), or you could use the predictorMatrix argument of the mice function. The arithmetic mean is the most commonly used mean. Events of cholesterol increased were less frequently reported in the sJIA population than in the adult RA population. Aroda VR, Ahmann A, Cariou B, et al. A factorial ANOVA is any ANOVA that uses more than one categorical independent variable. Your study might not have the ability to answer your research question. Each vial contains 80 mg of tocilizumab* in 4 mL (20 mg/mL). This Product Contains Dry Natural Rubber. When we calculate standard errors (i.e. The orange cap on the Repatha SureClick autoinjector contains a needle cover (located inside the cap) that contains dry natural rubber, which is made from latex. No test of humoral immunity in infant monkeys was conducted with evolocumab. (II) I would like to match on a subset of variables in my dataset, am I able to specify specific variables to match on? The gray needle cap on the Repatha prefilled syringe contains dry natural rubber, which is made from latex. data_het_sri$y[!is.na(data_het_sri$y)], If you accept this notice, your choice will be saved and the page will refresh. An approximately 20% decrease in the Cmax and AUC of evolocumab was observed in adult patients co-administered with a high-intensity statin regimen. Injection: 140 mg/mL solution in a single-dose prefilled syringe, Injection: 140 mg/mL solution in a single-dose prefilled SureClick, Injection: 420 mg/3.5 mL solution in a single-dose Pushtronex, Upper respiratory tract infection (6% versus 2%), Upper respiratory tract infection (9.1% versus 6.3%). Semaglutide was associated with greater reductions from baseline than placebo in waist circumference (13.54 cm with semaglutide vs. 4.13 cm with placebo; estimated treatment difference, 9.42 cm; 95% CI, 10.30 to 8.53), BMI (5.54 with semaglutide vs. 0.92 with placebo; estimated treatment difference, 4.61; 95% CI, 4.96 to 4.27), and systolic and diastolic blood pressure at week 68 (Table 2, Table S2, and Figs. Elevations of ALT/AST > 5 x ULN were observed in 0.7% of tocilizumab monotherapy patients and 1.4% of tocilizumab plus DMARD patients, the majority of whom were discontinued permanently from tocilizumab treatment. The exploratory end point in the prediabetes subpopulation was assessed in 593 participants in the semaglutide group and in 263 in the placebo group. Clinically significant hypersensitivity reactions associated with tocilizumab and requiring treatment discontinuation were reported in a total of 56 out of 4,009 patients (1.4%) treated with tocilizumab during the controlled and open label clinical studies. Doses below 1025 mg of this medicinal product contain less than 1 mmol sodium (23 mg), i.e. The Association for Academic Surgery is widely recognized as an inclusive surgical organization. Disclosure forms provided by the authors are available with the full text of this article at NEJM.org. Lancet 2018;392:637-649. Adverse reactions reported in at least 1% of REPATHA-treated patients, and more frequently than in placebo-treated patients, are shown in Table 2. Prescribers are reminded of the risk of false negative tuberculin skin and interferon-gamma TB blood test results, especially in patients who are severely ill or immunocompromised. (5.1). 17. The coefficient of variation is expressed as a percentage. Front Endocrinol (Lausanne) 2019;10:155-155. The frequency of ADRs in pJIA patients can be found in Table 3. If you or your child forget to use REPATHA or are not able to take the dose at the regular time, inject your or your child's missed dose as soon as you remember, as long as it is within 7 days of the missed dose. Eleven (6.8%) patients in the tocilizumab arm and five (3.1%) patients in the adalimumab arm experienced ALT increases of CTC grade 2 or higher. Remove the Repatha prefilled syringe carton from the refrigerator and wait 30 minutes. The median (range) level of CRP was 143 mg/L (75-982). In sJIA and pJIA patients, neutrophils and platelets should be monitored at the time of second infusion and thereafter according to good clinical practice, see section 4.2. Fig 1. Clean your injection site with an alcohol wipe. Different test statistics are used in different statistical tests. In the 12 week double-blind, controlled phase, 75 patients received treatment with tocilizumab (8 mg/kg or 12 mg/kg based upon body weight). A t-test measures the difference in group means divided by the pooled standard error of the two group means. The Association for Academic Surgery is widely recognized as an inclusive surgical organization. Mean hemoglobin increases at weeks 12, 24, and 52 were 2.5 vs 3.0 g/dL, 2.9 vs 2.8 g/dL, and 2.7 vs 2.8 g/dL with ferric maltol vs ferric carboxymaltose. head(iris) # First rows of Iris, As you can see based on Table 1, the Iris Flower data contains four numeric columns as well as the grouping factor column Species. In Study IV, tocilizumab was administered intravenously every 4 weeks in combination with other DMARDs vs. placebo and other DMARDs. par(bg = "#353436") # Background color This is called missing data imputation, or imputing for short. Figure 6. Radiographic mean changes over 52 weeks in Study II. ; margins is a shortcut for when you pivoted by two variables, but also wanted to pivot by each of those variables separately: it The most common effect sizes are Cohens d and Pearsons r. Cohens d measures the size of the difference between two groups while Pearsons r measures the strength of the relationship between two variables. We proofread: The Scribbr Plagiarism Checker is powered by elements of Turnitins Similarity Checker, namely the plagiarism detection software and the Internet Archive and Premium Scholarly Publications content databases. Since doing something an infinite number of times is impossible, relative frequency is often used as an estimate of probability. In case you want to learn more about the theoretical research concept of the mean, I can recommend the following video of the mathantics YouTube channel: Furthermore, you could also have a look at some of the related R tutorials that I have published on my website: I hope you found the tutorial helpful. lwd = 5, col = "#353436") Other outliers are problematic and should be removed because they represent measurement errors, data entry or processing errors, or poor sampling. Of course I do not want to deprive you of the proof! Some options to consider for imputation are: A mean, median, or mode value from that column. The on-body infusor and prefilled cartridge are not made with natural rubber latex. Key exclusion criteria were diabetes, a glycated hemoglobin level of 48 mmol per mole (6.5%) or greater, a history of chronic pancreatitis, acute pancreatitis within 180 days before enrollment, previous surgical obesity treatment, and use of antiobesity medication within 90 days before enrollment. Some of these columns can have up to 7 categories. N <- 3000 # Sample size Train patients and/or caregivers on how to prepare and administer REPATHA, according to the Instructions for Use and instruct them to read and follow the Instructions for Use each time they use REPATHA. Management of endocrine disease: are all GLP-1 agonists equal in the treatment of type 2 diabetes? # 27 blau C 7 Scores on the 36-Item Short-Form Health Survey (SF-36) are norm-based, transformed to a scale on which the 2009 general population of the United States has a mean score of 50 and a standard deviation of 10; higher scores indicate better quality of life. Guh DP, Zhang W, Bansback N, Amarsi Z, Birmingham CL, Anis AH. The test statistic you use will be determined by the statistical test. Banks PA, Bollen TL, Dervenis C, et al. bars indicate standard errors. by giving 3 injections consecutively within 30 minutes using the single-dose prefilled autoinjector or single-dose prefilled syringe. income[income < 0] <- income[income < 0] * (- 1) Benraouane F, Litwin SE. In cases where there are a small number of missing observations, data scientists can calculate the mean or median of the existing observations. A distinct value, such as 0 or -1. Cant seem to find an answer for this anywhere. Long-term persistence of hormonal adaptations to weight loss. At screening, most participants (75.0%) had at least one coexisting condition. Some options to consider for imputation are: A mean, median, or mode value from that column. WebCohort profile. Imputation means replacing a missing value with another value based on a reasonable estimate. This Instructions for Use has been approved by the U.S. Food and Drug Administration. # 30 blau C 9, # Mean by groups based on multiple grouping columns Actually, this is a very good question! In RA, pJIA and sJIA patients with baseline ALT or AST > 5 x ULN, treatment is not recommended. How do I know which test statistic to use? In an independent cohort of 15 patients (range: 975 years old) with axicabtagene ciloleucel-induced CRS, 53% responded. Table 7:Efficacy Results for Study VII (WA19926) on MTX-nave, early RA patients, HAQ-DI (adjusted mean change from baseline), Radiographic Endpoints (mean change from baseline), Radiographic Non-Progression n (%) (change from baseline in mTSS of 0), Week 24: ACR/EULAR Boolean Remission, n (%), Week 52: ACR/EULAR Boolean Remission, n (%). How is statistical significance calculated in an ANOVA? It describes how far from the mean of the distribution you have to go to cover a certain amount of the total variation in the data (i.e. The safety profile of tocilizumab in the paediatric population is summarized in the sections on pJIA and sJIA below. store the two means in the vector values as shown in Example 1. The dosage can be increased to 420 mg every 2 weeks if a clinically meaningful response is not achieved in 12 weeks. Different types of correlation coefficients might be appropriate for your data based on their levels of measurement and distributions. The loaded on-body infusor will lay flat on your body. It takes two arguments, CHISQ.TEST(observed_range, expected_range), and returns the p value. From the difference between the mean and the median, and also the distance of maximum values of the variables annual_inc, revol_util and total_rec_late_fee, it seems there are some outliers. More sophisticated algorithms like MissForest or MICE (both instances of the Iterative Imputer) or the kNNImputer provide much better imputation quality when mesured with the imputation RMSE. MSE is calculated by: Linear regression fits a line to the data by finding the regression coefficient that results in the smallest MSE. Figure 4. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, If you replace missings with means, naturally the mean is preserved. These are predictable consequences of what you do and not. For example, for the nominal variable of preferred mode of transportation, you may have the categories of car, bus, train, tram or bicycle. RoActemra can be given alone or in combination with corticosteroids. In the majority of patients, there was no increase in atherogenic indices, and elevations in total cholesterol responded to treatment with lipid lowering agents. Swing the door to the left. When ANC increases > 1 x 109/ l resume RoActemra at 4 mg/kg and increase to 8 mg/kg as clinically appropriate, When platelet count > 100 x 103/ resume RoActemra at 4 mg/kg and increase to 8 mg/kg as clinically appropriate. RoActemra 20 mg/mL concentrate for solution for infusion. A digital journal for innovative original research and fresh, bold ideas in clinical trial design and clinical decision-making. 26. Significant differences among group means are calculated using the F statistic, which is the ratio of the mean sum of squares (the variance explained by the independent variable) to the mean square error (the variance left over). Effect of REPATHA on Lipid Parameters in Pediatric Patients with HeFH (Mean % Change from Baseline to Week 24 in HAUSER-RCT), Table 9. For more information, call 1-844-REPATHA (1-844-737-2842) or visit www.REPATHA.com. However, a t test is used when you have a dependent quantitative variable and an independent categorical variable (with two groups). You find outliers at the extreme ends of your dataset. & Articles, All No new adverse reactions were observed during the open-label extension study. It is not known if REPATHA will harm your unborn baby. If it is categorical, sort the values by group, in any order. Find the sum of the values by adding them all up. I am fairly new to using R and am reaching out to inquire if you can help clarify how I would specify the following within my code? Much hinges on whether the variable with missing values is regarded as a response or outcome to be predicted or as a RA, sJIA, pJIA, CRS, and COVID-19 Patients 30 kg. # 22 gelb A 6 It is hard to know why imputation is though to help in that circumstance. No problem. Our data dictionary (zip file) includes detailed information, including frequencies, on all the data that are currently available. Benefits favoring semaglutide were also noted with respect to changes in glycated hemoglobin, fasting plasma glucose, C-reactive protein, and fasting lipid levels (Table 2). Around 95% of values are within 2 standard deviations of the mean. What does lambda () mean in the Poisson distribution formula? # versicolor 5.94 Clin Obes 2017;7:273-289. In Study I, tocilizumab was administered intravenously every four weeks as monotherapy. AIC is most often used to compare the relative goodness-of-fit among different models under consideration and to then choose the model that best fits the data. Denominators for the percentages of participants observed to have body-weight reduction of 5%, 10%, 15%, and 20% at week 68 are the numbers of participants for whom data were available at the week 68 visit 1212 participants in the semaglutide group and 577 participants in the placebo group. Same with median and mode. xlab = "X", ylab = "Y") At steady-state, predicted AUC and Cmin were 3.2 and 30 fold higher at 8 mg/kg as compared to 4 mg/kg, respectively. Additional safety variables are described in Table 3 and Table S6. The physician's global assessment of disease activity, as measured on a 0-100 mm scale, showed a Preprocessing data. Thank you for reading! Thank you for the comment, Julianna. This means that univariate imputation methods only use the non-missing values in a chosen feature (chosen by you), and impute the missing values in the same feature using either a constant that you provide or by using a statistical measurement (mean/median/mode) of that chosen feature. Although total lean body mass decreased in absolute terms (kg), the proportion of lean body mass relative to total body mass increased with semaglutide. legend("topleft", # Legend y[rbinom(N, 1, 0.2) == 1] <- NA # Insert 20% missing data in Y Study 2 (LAPLACE-2, NCT01763866) was a multicenter, double-blind, randomized controlled 12-week trial in which patients were initially randomized to an open-label specific statin regimen for a 4-week lipid stabilization period followed by random assignment to subcutaneous injections of REPATHA 140 mg every 2 weeks, REPATHA 420 mg once monthly, or placebo for 12 weeks. All patients in the study were initially treated with REPATHA 420 mg once monthly except for those receiving lipid apheresis at enrollment, who began with REPATHA 420 mg every 2 weeks. At week 52 and week 104 the co-primary endpoints were prevention of joint damage and improvement in physical function. Variability is also referred to as spread, scatter or dispersion. The following quote can be found in the help documentation of MICE: For predictors that are incomplete themselves, the most recently generated imputations are used to complete the predictors prior to imputation of the target column., Hello, I have a question. In most cases, researchers use an alpha of 0.05, which means that there is a less than 5% chance that the data being tested could have occurred under the null hypothesis. 90%, 95%, 99%). More specifically, RobustScaler removes the median and scales the data according to the interquartile range, thus making it less susceptible to outliers in the data. Effects of once-weekly semaglutide on appetite, energy intake, control of eating, food preference and body weight in subjects with obesity. Im fairly new to using R, after finding the mean values of two categorical groups I have how would I plot those means in a bar chart? Hepatic impairment: No formal study of the effect of hepatic impairment on the pharmacokinetics of tocilizumab has been conducted. Semaglutide was associated with greater reductions from baseline than placebo in waist circumference (13.54 cm with semaglutide vs. 4.13 cm with placebo; estimated treatment difference, 9.42 cm; 95% CI, 10.30 to 8.53), BMI (5.54 with semaglutide vs. 0.92 with placebo; estimated treatment difference, 4.61; 95% CI, 4.96 to 4.27), and systolic and diastolic blood pressure at week 68 (, The safety of semaglutide was consistent with that reported in the phase 2 study with once-daily dosing in participants with obesity, Case Records of the Massachusetts General Hospital, Prescribing Opioids for Pain The New CDC Clinical Practice Guideline, ReninAngiotensin System Inhibition in Advanced Chronic Kidney Disease, Covid-19 Vaccine Protection among Children and Adolescents in Qatar, Monkeypox A Sobering Sentinel for Pandemic Preparedness and Sexual Health System Capacity, Once-Weekly Semaglutide in Adolescents with Obesity, Self-Contained Neuromusculoskeletal Arm Prostheses, Brentuximab Vedotin with Chemotherapy in Pediatric High-Risk Hodgkins Lymphoma, Early Amino Acids in Extremely Preterm Infants and Neurodisability at 2 Years, Single-Dose Psilocybin for a Treatment-Resistant Episode of Major Depression, https://www.accessdata.fda.gov/drugsatfda_docs/label/2020/209637s003lbl.pdf, https://www.accessdata.fda.gov/drugsatfda_docs/label/2020/206321s011lbl.pdf, Evaluation of mRNA-1273 Vaccine in Children 6 Months to 5 Years of Age, NEJM Catalyst Innovations in Care Delivery, Hispanic or Latino ethnic group no. 12. When compared to the adult RA population, patients with sJIA experienced a higher frequency of nasopharyngitis, decrease in neutrophil counts, hepatic transaminases increased, and diarrhoea. The Association for Academic Surgery is widely recognized as an inclusive surgical organization. Thank you so much for this awesome feedback! The change in body weight from baseline to week 68 was 15.3 kg in the semaglutide group as compared with 2.6 kg in the placebo group (estimated treatment difference, 12.7 kg; 95% CI, 13.7 to 11.7). If you know or have estimates for any three of these, you can calculate the fourth component. What is the best way to show results of a multiple-choice quiz where multiple options may be right. Within 7 days from the missed dose, instruct the patient to administer REPATHA and resume the patient's original schedule. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Comparative efficacy, safety, and cardiovascular outcomes with once-weekly subcutaneous semaglutide in the treatment of type 2 diabetes: insights from the SUSTAIN 1-7 trials. Univariate imputer for completing missing values with simple strategies. For example, in Python, a simple one-liner # 23 gelb B 5 Treatment-emergent adverse events occurred in 59% and 36% of patients, respectively, and resulted in treatment discontinuation in 10% and 3% of patients, respectively. data source = https://www.kaggle.com/yasserh/loan-default-dataset. Thank you for the kind words! You can choose from four main ways to detect outliers: Outliers can have a big impact on your statistical analyses and skew the results of any hypothesis test if they are inaccurate. The sklearn.preprocessing package provides several common utility functions and transformer classes to change raw feature vectors into a representation that is more suitable for the downstream estimators.. Apply an adhesive bandage if needed. along with diet alone or together with other cholesterol-lowering medicines in adults with high blood cholesterol levels called primary hyperlipidemia (including a type of high cholesterol called heterozygous familial hypercholesterolemia [HeFH]) to reduce low density lipoprotein (LDL) or bad cholesterol. (Funded by Novo Nordisk; STEP 1 ClinicalTrials.gov number, NCT03548935). For example, = 0.748 floods per year. Serious and sometimes fatal infections have been reported in patients receiving immunosuppressive agents including RoActemra (see section 4.8, undesirable effects). You can simply substitute e with 2.718 when youre calculating a Poisson probability. A study-level meta-analysis of mortality by Day 28 was conducted on the three Roche studies and the RECOVERY study. Yumuk V, Tsigos C, Fried M, et al. Websklearn.impute.SimpleImputer class sklearn.impute. Draw randomly one of these three close cases and impute the missing value \(Y_i\) with the observed value of this close case. (just remove this variable or apply pmm). is there any syntax for swichting the rows and columns? For additional results, see Table 7 and Figure 5. Numerically greater responses compared with MTX alone were observed in the tocilizumab 8 mg/kg monotherapy group in all secondary endpoints, including radiographic endpoints. Each patient continued in Part II of the study until Week 40 or until the patient satisfied JIA ACR30 flare criteria (relative to Week 16) and qualified for escape to tocilizumab therapy (same dose received in Part I). The most serious ADRs were serious infections, complications of diverticulitis, and hypersensitivity reactions. To calculate the confidence interval, you need to know: Then you can plug these components into the confidence interval formula that corresponds to your data. Gallbladder-related disorders (mostly cholelithiasis) were reported in 2.6% and 1.2% of participants in the semaglutide and placebo groups, respectively. It is better to start from data understanding and then this article will be helpful starting point. In Study 5, 38% of patients had clinical atherosclerotic cardiovascular disease. Reductions in corticosteroids continued, with 44 patients off oral corticosteroids at week 44, while maintaining JIA ACR responses. Thus, CYP450 expression may be reversed when potent cytokine inhibitory therapy, such as tocilizumab, is introduced. FUN = mean) # Specify function (i.e. These decreases occurred without associated bleeding events. Table 4. (6), Established CVD: diabetes mellitus, nasopharyngitis and upper respiratory tract infection. The content of this site is intended for health care professionals. What if I hear the on-body infusor beep and see a red blinking light when it is on my body? In the open label extension phase, elevation in ALT or AST 3 x ULN occurred in 12% and 4% of patients, respectively, in the tocilizumab group. Thanks a lot for your hint! Does this depend on the type of the variable? The confidence level is 95%. Please accept YouTube cookies to play this video. More participants in the semaglutide group than in the placebo group achieved weight reductions of 5% or more (1047 participants [86.4%] vs. 182 [31.5%]), 10% or more (838 [69.1%] vs. 69 [12.0%]), and 15% or more (612 [50.5%] vs. 28 [4.9%]) at week 68 (P<0.001 for all three comparisons of odds). Imputation means replacing a missing value with another value based on a reasonable estimate. However, I would like to hear about your opinion! however, I find that , when I use mice in R, I still could get the predicated yi, even if the x1i, x2i,xni are although missing. The 3 most common measures of central tendency are the mean, median and mode. Significant reduction in DAS28 from baseline (mean improvement) of 3.13.4 were observed in tocilizumab-treated patients compared to control patients (1.3-2.1). In seven pooled 12-week, double-blind, randomized, placebo-controlled trials, 993 patients received 140 mg of REPATHA subcutaneously every 2 weeks and 1059 patients received 420 mg of REPATHA subcutaneously monthly. data <- data.frame(name = sample(c("blau", "rot", "gelb"), 30, replace = TRUE), Make sure that you give your injection. Can I move the autoinjector around on my skin while I am choosing an injection site? 39. # 2 Female 4 5 1 Study V evaluated 499 patients who had an inadequate clinical response or were intolerant to one or more TNF antagonist therapies. Turn the tray over and gently press the middle of the tray's back to release the syringe into your palm. Supportive secondary end-point analyses were not controlled for multiple comparisons and should not be used to infer definitive treatment effects. Find a distribution that matches the shape of your data and use that distribution to calculate the confidence interval. If your healthcare provider decides that you or your child or a caregiver can give REPATHA, you or your child or your caregiver should receive training on the right way to prepare and inject REPATHA. The used on-body infusor will beep when removed from your skin. ap value is adjusted for region and duration of RA for all endpoints and additionally baseline value for all continuous endpoints. In Studies II, III and V, tocilizumab was administered intravenously every four weeks in combination with MTX vs. placebo and MTX. Following 1 year of treatment with tocilizumab plus MTX, 85% of patients (n=348) had no progression of structural joint damage, as defined by a change in the Total Sharp Score of zero or less, compared with 67% of placebo plus MTX-treated patients (n=290) (p 0.001). Use of REPATHA for this indication is supported by evidence from an adequate and well-controlled trial in adults and pediatric patients aged 13 years and older with HoFH (including 7 pediatric patients treated with REPATHA) and from open-label studies which included an additional 19 pediatric patients aged 11 years and older with HoFH not previously treated with REPATHA [see Adverse Reactions (6.1) and Clinical Studies (14)]. Doses of 8 mg/kg tocilizumab or placebo were given every four weeks in combination with stable DMARDs. x = round(rnorm(30, 5, 5))) No. We have covered Null value imputation methods; We have also covered step by step analyzing techniques such as Univariate analysis, Bivariate analysis, Multivariate analysis, etc; Find the link to the source code here. Evolocumab has an approximate molecular weight (MW) of 144 kDa and is produced in genetically engineered mammalian (Chinese hamster ovary) cells. Categorical values are generally imputed with the mode as it represents the value that is the most common for the given column. However, evaluating the imputation output is something everybody should do in general. Interrupt RoActemra dosing until < 3 x ULN and follow recommendations above for > 1 to 3 x ULN, For persistent increases > 3 x ULN, discontinue RoActemra. Quantitative variables can also be described by a frequency distribution, but first they need to be grouped into interval classes. Is the correlation coefficient the same as the slope of the line? WebMethod: The type of imputation to perform. Mean imputation is generally bad practice because it doesnt take into account feature correlation. my columns are called frame_number, name, x,y. If some outliers are present in the set, robust scalers Similarly, there were no effects of evolocumab on the humoral immune response to KLH (after 3 to 4 months exposure) in a 6-month study in cynomolgus monkeys at dose levels up to 300 mg/kg once weekly evolocumab corresponding to exposures 744- and 300-fold greater than the recommended human doses of 140 mg every 2 weeks and 420 mg once monthly, respectively, based on plasma AUC.
Network And Systems Administrator Job Description, Stuck On Locating Server Minecraft Ps4, Most Effective Rodent Control, Gardentech Sevin Insect Killer Liquid, Vps Vaasa Vs Sjk Seinajoki Prediction, Synonym And Antonym Analogies Answer Key, Bending Stress On A Hollow Cylinder, Hikvision Distributor In Kolkata, Hearing Range 7 Letters,