Variables were categorized to allow calculation of risk ratios (RR) with 95% confidence intervals (CI).
We categorized secure messaging to allow for nonlinearities and to increase the interpretability of our results.
We fitted an adjusted model including the following fixed pre-ART characteristics: age (18-35, 350+0, 50+), sex (male, female), WHO disease stage (2, 3, 4), body mass index (BMI) (-20, 20-27, 27+), and CD4 cell count (0-49, 50-99, 100-149, 150-199), categorizing continuous variables to allow for non-linearity.
In addition, Models 7 and 8 proxy the severity of an MP's expense overclaiming by measuring the amount an MP was asked to repay by Legg (measured continuously in Model 7 and categorized in Model 8 to allow for nonlinearities).
(The hashtag [e.g., #accutaneprobz] placed in the body of a post is a way to categorize or tag the post to allow for quick retrieval via subsequent searching, similar conceptually to an email folder; the 'at' sign placed in front of a Twitter username constitutes a 'mention', directing the message to the username in question, similar conceptually to an email address).
We categorized age into five groups 60-644, 65-69, 70-74, 75-79, and 80 years and older) to allow for non-linear relationships, and categorized education level, recorded as highest grade attained, into three groups (0-8, 9-12, and 13-17 years). 13-17 years
Practice size was categorized similarly to previously published work [ 19] to allow for comparisons.
We will also categorize patients' vocational activity according to Bureau of Labor Statistics definitions, to allow for comparison with peers in local and national samples.
To allow for potential non-linear relationships, we categorized lead exposure into quintiles and compared quintiles two, three, four, and five to the lowest quintile.
