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Table 3 Logistic regression estimates of the treatment on treated effect of SMS reminders on adherence to treatment advice

From: SMS messages increase adherence to rapid diagnostic test results among malaria patients: results from a pilot study in Nigeria

Primary outcome Percentage (N) SMS SMS
  Received SMS (n = 174) SMS not sent (n = 206) SMS risk ratio (95% CI) Risk difference (95% CI)
1 Followed treatment advice 81.6% (142) 65.5% (135) 2.33 (1.62–3.36) 16.1% (8.89%–23.2%)
2 Followed treatment advice*    1.84 (1.19–2.85) 11.3% (3.76%–18.9%)
3 Followed treatment advice**    2.34 (1.46–3.74) 15.5% (7.86%–23.2%)
4 Followed treatment advice***    1.68 (1.08–2.61) 9.68% (1.84%–17.5%)
  1. Exclude 39 observations who were sent a text message but who reported not seeing the text message in the follow-up survey, N = 380.
  2. *Controls for city survey was conducted (Ibadan/Ogbomosho) and treatment* city survey was conducted (Model 2).
  3. **Controls for city survey was conducted (Ibadan/Ogbomosho), treatment* city survey was conducted, whether assignment to the treatment/control group was made off-protocol, and treatment* whether survey assignment to the treatment/control group was made off-protocol (Model 3).
  4. ***Controls for city survey was conducted (Ibadan/Ogbomosho), treatment* city survey was conducted, whether assignment to the treatment/control group was made off-protocol, and treatment* whether survey assignment to the treatment/control group was made off-protocol, an indicator variable for surveys conducted at PPMVs, an indicator variable for participant who had a bank account, and an indicator variable for participant could not read or write (Model 4).
  5. Standard errors are clustered by retail site.