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Table 8 Main test score results at 1-year follow-up

From: Effects of the Informed Health Choices primary school intervention on the ability of children in Uganda to assess the reliability of claims about treatment effects, 1-year follow-up: a cluster-randomised trial

 Control schoolsIntervention schoolsAdjusted differenceaOdds ratioaICC
Primary outcome
 One-year follow-up
  Mean score, %Mean score: 53.0%
(SD 16.8%)
Mean score: 68.7%
(SD 18.2%)
Mean difference: 16.7%
(95% CI, 13.9% to 19.5%)
P < 0.00001
 0.18
 End of intervention term
  Mean score, %Mean score: 43.1%
(SD 15.2%)
Mean score: 62.4%
(SD 18.8%)
Mean difference: 20.0%
(95% CI, 17.3% to 22.7%)
 0.18
 One-year follow-up
  Passing score (≥ 13 of 24 correct answers)51.5% of children
(n = 1464/2844)
80.1% of children
(n = 3160/3943)
39.5% more children
(95% CI, 29.9% to 47.5%)
5.88
(95% CI, 4.00 to 8.33)
P < 0.00001
0.20
 End of intervention term
  Passing score (≥ 13 of 24 correct answers)26.8% of children (n = 1186/4430)69.0% of children (n = 3967/5753)49.8% more children (95% CI, 43.8% to 54.6%)9.34 (95% CI, 6.62 to 13.18)0.19
Secondary outcomes
 One-year follow-up
  Mastery score (≥ 20 of 24 correct answers)4.9% of children (n = 139/2844)28.9% of children (n = 1138/3943)25.0% more children (23.2–26.5%)10.00
(95% CI, 6.67 to 16.67)
P < 0.00001
0.19
 End of intervention term
  Mastery score (≥ 20 of 24 correct answers)0.9% of children (n = 38/4430)18.6% of children (n = 1070/5753)18.0% more children (95% CI, 17.5% to 18.2%)35.33 (95% CI, 20.58 to 60.67)0.21
Teachers’ scores
 One-year follow-up
  Mean score, %Mean score: 68.5% (SD 14.9%)Mean score: 86.2% (SD 10.2%)Mean difference: 17.5% (13.2% to 21.8%)
P < 0.00001
  
 End of intervention term
  Mean score, %Mean score: 66.7% (SD 14.3%)Mean score: 84.6% (SD 17.1%)Mean difference: 18.3% (95% CI, 12.9% to 23.3%)  
 One-year follow-up
  Passing score (≥ 13 of 24 correct answers)85.9% of teachers (n = 50/59)98.7% of teachers (n = 77/78)9.4% more teachers (1.3% to 52.0%)9.12b
(95% CI, 2.01 to 86.7)
P = 0.003
 
 End of intervention term
  Passing score (≥ 13 of 24 correct answers)86.6% of teachers (n = 58/67)97.6% of teachers (n = 83/85)11.3% more teachers (95% CI, 4.0% to 13.0%)7.24 (95% CI, 1.49 to 35.26) 
 One-year follow-up
  Mastery score (≥ 20 of 24 correct answers)22.0% of teachers (n = 13/59)67.9% of teachers (n = 53/78)46.5% more teachers (28.1% to 61.3%)7.70
(95% CI, 3.56 to 17.70)
P < 0.00001
 
 End of intervention term
  Mastery score (≥ 20 of 24 correct answers)14.9% of teachers (n = 10/67)71.8% of teachers (n = 61/85)56.7% more teachers (95% CI, 37.3% to 70.4%)14.38 (95% CI, 6.24 to 33.14) 
  1. aThe adjusted difference is based on mixed models with a random effects term for the clusters (for the children only) and the stratification variables modelled as fixed effects, using logistic regression for dichotomous outcomes and linear regression for continuous outcomes. The odds ratios from the logistic regressions have been converted to differences based on the intervention school proportions and the odds ratios calculated using the intervention schools as the reference (the inverse of the odds ratios shown here)
  2. bPenalized-maximum likelihood logistic regression (R package ‘logistf’) was used for this analysis because of rare events (only one teacher in the intervention group did not have a passing score)