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Stata se version 16

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Stata SE version 16 is a statistical software package designed for data analysis, management, and visualization. It provides a wide range of tools for various types of statistical modeling, including linear regression, logistic regression, and time series analysis, among others. Stata SE version 16 is a more powerful and feature-rich version of the standard Stata software, offering expanded memory capacity and enhanced performance for large datasets.

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206 protocols using stata se version 16

1

Pharmacokinetic Analysis of Levodopa Dosing

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Patients’ characteristics were summarized by mean and standard deviation (SD) or median and interquartile range (IQR) for the continuous variables, and with absolute (n) and relative (%) frequency for categorical variables. Normality of continuous variables distribution was checked using the Skewness-Kurtosis test. Continuous variables were compared by Mann-Whitney U test or Student’s t test, while categorical variables by Chi-square test.
Distribution of milligrams of LD per kg, Cmax and AUC range for administrated test dose were graphically represented by box plot. Linear association between milligrams of LD per kg and pharmacokinetic parameters was expressed by Spearman correlation coefficients.
Univariate linear regression models were performed to quantify the relationship between each pharmacokinetic parameter (dependent variable) and matched patients’ characteristics (independent factors); subsequently, factors found to be clinically relevant and significant in the univariate analysis were entered into a multiple linear regression model. Value assumed by each dependent variable was predicted through the best linear combination of independent variables. All Ordinary Least Square regression assumptions were checked.
Analyses were performed by means of STATA SE version 16 software (Stata Corporation LLC, College Station, TX, USA).
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2

Exploring COVID-19 Outcomes in Long-Term Care

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Descriptive statistics including frequencies and percentages for categorical variables and means with standard deviations (SD) for normally distributed continuous variables and medians with interquartile ranges (IQR) for skewed continuous variables were used to describe characteristics of COVID-19 cases. Data were stratified by sex and LTC residency. Kaplan Meier curves were used to visually represent the cumulative proportion of cases’ time to acute care hospitalization or death, stratified by LTC residency. Chi-squared analyses were used to compare mortality rates in LTC versus non LTC residents stratified by age.
We used adjusted modified Poisson models to explore variables of age, sex, number of hospitalizations in year prior to diagnosis of COVID-19, and comorbidities associated with poor outcomes in LTC residents. Poor outcomes included mortality, hospitalization, ICU admission and mechanical ventilation within 60 days.
All statistical analyses were done using STATA/SE version 16 software (StataCorp, College Station, TX). Ethics for this study was granted by the University of Calgary health research ethics board (REB20-0688). The data used for this study is not publicly available as it released by AHS. However, this data can be obtained through appropriate ethics application and liaison with AHS.
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3

Interobserver Agreement for AE-IPF Diagnosis

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Interobserver agreement for the AE-IPF diagnosis between both respiratory specialists was evaluated using kappa statistics. For cases diagnosed as AE-IPF by two respiratory physicians, the interobserver agreement for AE-IPF diagnosis between both radiologists was assessed using the AC1-index since most cases were considered to be true positive cases [19 (link)]. We calculated the PPV as true positives / (true positives + false positives) for every disease name and their combinations. Further, we calculated the 95% confidence intervals (CIs) for binomial distribution using the exact method. We could not calculate the sensitivity, specificity, and negative predictive values since we did not perform a chart review of patients without target ICD-10 codes. Validation studies for only obtaining a PPV have reported that a sample size of approximately 100 is sufficient [20 (link)], because with that number of samples, the 95% CI falls within the range of the point estimate ± 0.1. We sought to identify patients from various disease names and search for algorithms that would improve PPV. Therefore, regarding the narrow criteria, we identified the final criteria with the largest PPV out of approximately 100 cases. Statistical analyses were performed using STATA/SE version.16.0 (Stata Corp., College Station, TX, USA).
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4

Comparative Statistical Analysis of Demographic Data

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Demographic variables were compared between groups using independent t-test for continuous variable and chi-square tests for categorical variables. Statistical significance was set at a two-tailed p<0.05. All statistical analyses were performed using Stata SE version 16.0 (StataCorp LP, College Station, Texas, USA).
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5

Dietary Sodium and BNP Levels

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Sample size was calculated with Stata SE version 16.0. Based on the study of Paterna et al. [11 (link)] mean ± standard deviation of BNP after 180 days of a diet with ~2800 mg of sodium/day was 555 ± 175 pg/mL vs. 745 ± 305 pg/mL with a diet of ~1800 mg sodium/day. For a significance level of alpha = 0.05, and a statistical power of 0.80, the minimum sample size was calculated as 29 patients per group. Assuming a 20% dropout rate the final sample size was estimated to be 70 patients.
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6

Predictors of Unplanned Admission Identification

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STATA SE version 16.0 (StataCorp, College Station, TX, USA) was used to analyze data. Categorical data were analyzed by the Fisher exact test or chi-square test, and continuous variables were analyzed using unpaired t-test or Wilcoxon rank-sum test for data as appropriate. Univariate logistic regression analysis was used to determine the predictors associated with UOA. Multivariate logistic regression analysis with stepwise was performed and included variables with a p-value less than 0.10 from the univariate analysis. Significant difference was defined as p-value < 0.05. The Spearman coefficient and scatter plot were used to identify the correlation between the significant variable and the most common cause of unplanned admission. The receiver operating characteristic (ROC) curve with the Youden index was used to determine the cut-off value for the significant variable. The performance test of the prediction model was calculated to determine the sensitivity, specificity, and positive and negative predictive value in each model.
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7

Dietary Clustering and Metabolic Profiles

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Prior to applying the k-means algorithm to cluster the adolescents, it was also made sure that the information was complete and there was no missing data. Further, after analysing the clustering tendency of the data and obtaining the optimum value of k, k-means algorithm was used to finally cluster the data into k clusters using the ‘sklearn’ library in Python [28 ]. Clustering was done based on seventeen available dietary items available in order to diminish subjectivity of these items. Evaluation of each cluster by background characteristics, using descriptive analyses was done. Phenotypic characteristics of each cluster was also analysed. Further, distribution of each component of metabolic syndrome and micronutrient deficiencies within all five clusters was analysed. Lastly, association of any metabolic syndrome and micronutrient deficiencies with clusters were also explored using chi square test for association.
The study followed the STrengthening the Reporting of Observational studies in Epidemiology (STROBE) reporting guidelines for cross-sectional study (Additional file 1). National weights of biomarker have been used while exploring and computational analysis. STATA(SE) version 16.0 software has been used for data analysis and data wrangling and “sklearn” library in python was used to perform k-means cluster analysis.
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8

Genetic Associations in Pharmacotherapy

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Linkage disequilibrium between CYP2C8*3 SNPs was calculated with the LDlink 4.1.0 LDassoc Tool [29 (link)]. Allele frequencies and Hardy Weinberg equilibrium were analysed through the Fisher’s exact test. Statistical associations between CYP2C8*2 and/or CYP2C8*3 allele carriers and treatment outcome or adverse events were assessed by Fisher’s exact test. All analyses were performed in STATA/SE version 16.0; statistical significance was defined as P < 0.05.
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9

Comparative Analysis of Responder Profiles

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Continuous baseline variables are reported as medians and interquartile ranges (IQRs), and categorical variables are reported as frequencies. Differences between categorical characteristics of responders versus partial and non-responders were investigated using Fisher's exact test, and the Wilcoxon rank-sum test was applied for continuous variables. The analyses were performed using Stata/SE version 16.0 (StataCorp, College Station, TX, USA), and a statistical significance level of 5% was used throughout. GraphPad Prism (GraphPad Software 9.4.1) and Power-Point 2019 were used to create the figures.
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10

Spatial Analysis of Uninformed Choice

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Data were processed, reviewed, sorted, and recoded using STATA/SE version 16.0. To account for the effects of the survey’s complex sampling design or the hierarchical nature of the EDHS dataset, to restore survey representativeness, and to obtain reliable statistical estimates, the data were weighted via applying the STATA command "svyset." This command was prepended to each analysis in this study.
Arc GIS version 10.8 software was used to visualize the spatial distribution and locate hotspot areas (clusters).To measure the deviation of the spatial arrangement of the uninformed choice from randomness, the global spatial autocorrelation (Global Moran’s I) was calculated [18 (link), 19 (link)]. A positive value of Moran’s I represent positive spatial autocorrelation (cluster together), whereas a negative value indicates dispersed arrangement.
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