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We used STATA 12 (StataCorp, College Station, Texas) survey command (svy) to analyze the data.
The Survey command in STATA was used to declare the strata and primary sampling unit.
To adjust for the effect of the cluster design, data were reanalyzed using STATA 13.0 with survey command.
Robust SEs were generated via the Stata survey command to account for the clustering within school classes.
To adjust for the effect of the cluster design, data were reanalysed using STATA 9.0 with survey command.
To examine the association between two categorical variables we used Pearson's χ statistic, adjusted for clustering using the survey command in Stata.
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We accounted for NHAMCS variable changes spanning the study period, and all analyses used appropriate survey commands in Stata to account for the sampling frame.
Estimates were made using the "svy" (survey commands) functions of the STATA program, which enabled us to incorporate the sampling design and weights into all of our statistical calculations (descriptive OR, logistic regression).
Analyses were conducted using the SPSS for Windows version 14 and the survey commands of STATA release 8.
This was done using the complex survey commands within stata.
We used the survey commands in Stata (svyset) for analyses.
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