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Table 2 Baseline characteristics of the study population and results of univariate analyses of the possible confounders in relation to Cito-test scores

From: Methylphenidate use and school performance among primary school children: a descriptive study

  Never users M ± SD Current users M ± SD Subgroups p value interaction p value
Total 534.71 ± 9.47 532.80 ± 9.44 <0.001***  
Sex     .020*
 Boys 535.25 ± 9.42 533.60 ± 9.26 0.004**  
 Girls 534.27 ± 9.49 529.75 ± 9.55 <0.001***  
Ethnicity     .296
 Dutch 535.09 ± 9.33 532.82 ± 9.41 <0.001***  
 Non-Dutch 531.97 ± 10.0 532.37 ± 10.27 .86  
Parent Household     .762
 Two-parent household 535.18 ± 9.40 533.20 ± 9.42 <0.001***  
 Single-parent household 532.55 ± 9.49 531.07 ± 9.42 .20  
Household income     .101
 Low 532.31 ± 9.68 531.26 ± 9.21 .17  
 Intermediate 535.41 ± 9.11 533.70 ± 9.50 0.019*  
 High 539.20 ± 7.81 535.63 ± 9.27 0.005**  
Treated concurrently with
 Asthma medication 537.10 ± 8.52 535.64 ± 8.94 .591  
  1. Abbreviations: n, sample size; M, mean; SD, standard deviation
  2. *Significant at .05 level**Significant at the 0.01 level
  3. ***Significant at the 0.001 level