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Table 1 Comparison of the characteristics between never users and current users

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

  Never users, n (%) Current users, n (%) p value
(Chi2)
Total 7295 (100) 377 (100)  
Sex    <.05*
 Boys 3275 (44.9) 298 (79.0)  
 Girls 4020 (55.1) 79 (21.0)  
Ethnicity    <.05*
 Dutch 6407 (87.8) 358 (95.0)  
 non-Dutch 888 (12.2) 19 (5.0)  
Parent Household    .656
 Two-parent household 5987 (82.1) 306 (81.2)  
 single-parent household 1308 (17.9) 71 (18.8)  
Household income    <.05*
 low 3010 (41.3) 171 (45.4)  
 intermediate 3176 (43.5) 166 (44.0)  
 high 1109 (15.2) 40 (10.6)  
Treated concurrently with
 Asthma medication 100 (1.4) 11 (2.5) <.05*
 Antipsychotics   19 (4.3)  
 Only MPH users   347 (78.7)  
Start of MPH treatment
 Late ≤12 months   38 (10.1)  
 Early >12 months   339 (89.9)  
Dosage of MPH treatment
  ≤ 0.999 NDDD/Day   202 (53.6)  
  > 0.999 NDDD/Day   132 (35.0)  
  1. Abbreviations: n, sample size; NDDD, number of Defined Daily Dose
  2. * Significant at .05 level