Table 2

Results of the weighted ANOVAs of qualitative moderator variables on the lifetime prevalence estimates
Moderator variable k p+ 95% C. I. ANOVA results
pl pu
Continent:
 Europe 21 0.390 0.314 0.472 QB(4) = 1.95, p = .745; R2 = 0.0
 North America 3 0.455 0.255 0.670 QW(25) = 4227.25, p < .001
 Oceania 1 0.403 0.128 0.757
 Africa 2 0.277 0.114 0.532
 Asia 3 0.490 0.285 0.698
Origin of the sample:
 School 25 0.398 0.333 0.467 QB(3) = 0.87, p = .833; R2 = 0.0
 Community 2 0.396 0.197 0.638 QW(26) = 3833.03, p < .001
 University 2 0.470 0.249 0.703
 School + sport 1 0.280 0.085 0.619
Data extraction method:
 Questionnaire 23 0.411 0.354 0.471 QB(1) = 0.36, p = .546; R2 = 0.143
 Interview 4 0.365 0.243 0.507 QW(25) = 2345.19, p < .001

k: number of studies. p+: mean prevalence. pl and pu: lower and upper confidence limits of the 95% confidence interval around the mean prevalence. QB: between-categories statistic to test the influence of the moderator variable on the prevalence rates. QW: within-categories statistic to test the model misspecification. R2: proportion of variance accounted for by the moderator variable.

Calvo-Muñoz et al.

Calvo-Muñoz et al. BMC Pediatrics 2013 13:14   doi:10.1186/1471-2431-13-14

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