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Univariate and bivariate analyses were conducted using Stata Version 12 [ 16].

Bivariate analyses were conducted using χ and t tests as appropriate.

Bivariate analyses were conducted using cross-tabulations and chi-square statistics.

Bivariate analyses were conducted using t-tests and Wilcoxon tests to compare means and medians for normally and non-normally distributed continuous variables respectively between two categories.

Pairwise bivariate analyses were conducted using 1) the raw scores and 2) loge(score+1) transformation of each of the aggregate groups (SCORE4 9 and SCORE1 3), as described previously.

Bivariate analyses were conducted using the chi-squared test and t-test as appropriate (a probability level of 0.05 was set for statistical significance).

Bivariate analyses were conducted using t tests for continuous variables and χ tests for categorical variables.

Bivariate analyses were conducted using cross-tabulations, Chi-squared statistics and Mann Whitney U tests.

Bivariate analyses were conducted using the two outcome measures (discrete and dichotomous repeat visits) separately and comparing them to all of the demographic factors of interest.

Bivariate analyses were conducted using Chi Squares (Cramer's V and Phi) as well as T-tests, one-way ANOVAs, Mann-Whitney U, and Kruskal-Wallis H. Kruskal-Wallis H

Bivariate analyses were conducted using Chi-square or Fisher's exact test (when Chi-square assumptions were not met) to examine relationships between categorical variables.