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Table 17 Subgroup analysis: reading skillsa

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 differencebOdds ratioICC
Mean score, %
 Lacking basic reading skills (N = 1775)No. of children = 893No. of children = 882   
Mean score: 47.2%
(SD 16.4%)
Mean score: 57.1%
(SD 18.1%)
Mean difference: 11.2%
(95% CI, 8.2% to 14.2%)
 0.146
 Basic reading skills (N = 2672)No. of children = 1093No. of children = 1579   
Mean score: 55.2%
(SD 16.9%)
Mean score: 67.9%
(SD 16.8%)
Mean difference: 14.8%
(95% CI, 12.3% to 17.3%)
 0.162
 Advanced reading skills (N = 2340)No. of children = 858No. of children = 1482   
Mean score: 56.3%
(SD 15.6%)
Mean score: 76.5%
(SD 15.5%)
Mean difference: 19.4%
(95% CI, 16.9% to 21.9%)
 0.117
Passing score (≥ 13 of 24 correct answers)
 Lacking basic reading skills (N = 1775)No. of children = 893No. of children = 882   
36.6% of children
n = 327
59.3% of children
n = 523
28.9% more children
(95% CI, 20.8% to 36.7%)
0.30
(95% CI, 0.20 to 0.43)
0.144
 Basic reading skills (N = 2672)No. of children = 1093No. of children = 1579   
57.0% of children
n = 623
81.2% of children
n = 1282
33.6% more children
(95% CI, 24.0% to 41.9%)
0.21
(95% CI, 0.15 to 0.31)
0.150
 Advanced reading skills (N = 2340)No. of children = 858No. of children = 1482   
60.0% of children
n = 514
91.4% of children
n = 1355
33.4% more children
(95% CI, 25.7% to 42.5%)
0.13
(95% CI, 0.09 to 0.18)
0.098
Mastery score (≥ 20 of 24 correct answers)
 Lacking basic reading skills (N = 1775)No. of children = 893No. of children = 882 0.22 
3.0% of children
n = 27
10,1% of children
n = 89
7.7% more children
(95% CI, 5.6% to 8.8%)
(95% CI, 0.12 to 0.42)0.220
 Basic reading skills (n = 2672)No. of children = 1093No. of children = 1579 0.15 
6.5% of children
n = 71
24.1% of children
n = 380
19.6% more children
(95% CI, 17.0% to 21.3%)
(95% CI, 0.09 to 0.24)0.192
 Advanced reading skills (n = 2340)No. of children = 858No. of children = 1482 0.06 
4.8% of children
n = 41
45.1% of children
n = 669
40.4% more children
(95% CI, 38.2% to 41.9%)
(95% CI, 0.04 to 0.09)0.139
  1. aBecause reading skills were measured after the intervention, we have not reported a test of interaction here (see Additional file 2)
  2. bThe adjusted difference is based on mixed models with a random effects term for the clusters 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 for passing scores and mastery scores have been converted to differences using the intervention school proportions and the inverse of the odds ratios shown here