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Table 2 The mean score change on danger signs between intervention and controls (N = 450)

From: Improving pregnant women’s knowledge on danger signs and birth preparedness practices using an interactive mobile messaging alert system in Dodoma region, Tanzania: a controlled quasi experimental study

VariablesControlInterventionP-valueCohen’s d effect size
Mean score (SD)95% CI (lower –upper)Mean score (SD)95% CI (lower –upper)
Knowledge
 Pre-test4.71 (3.382)4.344–5.2354.78 (3.227)4.303–5.4950.826 
 Post-test6.518 (4.304)6.145–6.8919.531(2.666)9.003–10.0590.0000.85
  1. *Ancova test results