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Table 2 List of subgroups and potential covariates

From: The HAART cell phone adherence trial (WelTel Kenya1): a randomized controlled trial protocol

Subgroups of interest Potential covariates
Urban vs. rural Age
By clinic Gender
Female vs. male Distance from clinic
Phone ownership (owned vs. shared) Income level
Occupational designation Cost to attend clinic
Level of education Level of literacy
Usual mode of transportation used Baseline quality of life
  HIV staging
  Level of disclosure of status
  Crossover into intervention
  1. HAART = highly active antiretroviral therapy.