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Table 1 Rules applied to classify correlates of physical activity

From: Correlates of physical activity and sedentary behaviour in the Thai population: a systematic review

Percentage of studies (%)a Code describing the association between a correlate and PA or SBb Meaning of the code
0 - 59 ? Mostly non-significant, indeterminate, or inconsistent associations
60 - 100 + or – Mostly positive (+), or negative (–) associations
  1. aPercentage of studies showing positive, negative, or non-significant association
  2. bWhen four or more studies showed positive or negative association, the summary results were coded as ++, and --, respectively. The code “??” denoted a frequently studied correlate whose association with PA or SB was largely inconsistent across the studies