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Table 2 Comparing relative differences for boys and girls in the multiaxial classifications in the two groups of children with ADHD; MoBa and the general child population (All)

From: ADHD, comorbid disorders and psychosocial functioning: How representative is a child cohort study? Findings from a national patient registry

  MoBa All Statistics
N (1) (%) N (2) (%) Ratio of relative frequencies (95% CI), p, d
With axis I comorbidity
 -girls 100 (24.4) 701 (24.5) 1.00 (0.84–1.20), p = 0.98
 -boys 370 (31.2) 2576 (31.2) 1.01 (0.92–1.10), p = 0.88
With axis II comorbidity
 -girls 81 (19.8) 562 (19.6) 1.01 (0.82–1.25), p = 0.91
 -boys 227 (19.2) 1704 (20.6) 0.93 (0.82–1.06), p = 0.28
With axis III comorbidity
 -girls 3 (0.7) 55 (1.9) 0.38 (0.12–1.22), p = 0.10
 -boys 18 (1.5) 140 (1.7) 0.90 (0.55–1.47), p = 0.68
Axis V scores Mean (SD) Mean (SD)  
 -girls 0.56 (0.79) 0.79 (0.98) t = 4.55, p < 0.0001, d = -.26
 -boys 0.66 (0.92) 0.82 (1.02) t = 5.11, p < 0.0001, d = -.21
Axis VI scores
 -girls 55.8 (13.2) 54.2 (16.6) t = -1.87, p = 0.06, d = .11
 -boys 54.7 (12.9) 51.7 (17.3) t = -5.75, p < 0.0001, d = .20
  1. 1 MoBa; the Norwegian Mother and Child Cohort Study: Total number of girls = 410, and boys = 1185, 2All: Total number of girls = 2865, and boys = 8254