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Table 3 Comparing relative differences for children with and without axis I comorbidity in the multiaxial classifications in the two groups 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 (a) (%) N (b) (%) Ratio of relative frequencies (95% CI) p, d
With axis II comorbidity
 -with axis I comorbididity 104 (22.1) 666 (20.3) 1.09 (0.91–1.31), p = 0.36
 -without axis I comorbidity 204 (18.1) 1600 (20.4) 0.89 (0.78–1.01), p = 0.08
With axis III comorbidity
 -with axis I comorbidity 470 (2.1) 3277 (2.4) 0.88 (0.46–1.69), p = 0.71
 -without axis I comorbidity 11 (1.0) 116 (1.5) 0.66 (0.36–1.22), p = 0.19
Axis V scores Mean (SD) Mean (SD)  
 -with axis I comorbidity .94 (1.1) 1.17 (1.21) t = 3.89, p = 0.0001, d = -.20
 -without axix I comorbidity .51 (.75) .66 (.88) t = 5.44, p < 0.0001, d = -.18
Axis VI scores
 -with axis I comorbidity 51.0 (15.3) 48.2 (18.3) t = -3.16, p = 0.002, d = .17
 -without axis I comorbidity 56.7 (11.7) 54.2 (16.2) t = -4.99, p < 0.0001, d = .18
  1. MoBa the Norwegian Mother and Child Cohort Study; aMoBa: Total number with axis I-comorbidity = 470, without = 1125, bAll: Total number with axis I-comorbidity =3277, without = 7842