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Table 1 NPR-descriptives and multiaxial classifications in children with ADHD in MoBa (n = 1595) and the general child population; All (n = 11 119)

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

NPR-descriptives Mean (sd) MoBa Mean (sd) All Statistics
Age (years) at first contact in CAMHS 7.07 (1.84) 7.64 (1.97) t = -12.3, df = 1594, p < 0.0001, d = -.30(a)
Age (years) at first ADHD diagnosis in CAMHS 7.87 (1.76) 8.38 (1.96) t = -.11.5, df =1594, p < 0.0001, d = -.27(a)
Number of days in CAMHS 858 (566) 949 (604) p = 0.85(b)
Number of contacts in CAMHS 38 (40) 44 (51) p = 0.03, d = -.13(b)
Multiaxial classifications % MoBa % All  
Axis I, psychiatric disorders 29.5% 29.5% z = 0, p = 1.0(c)
Axis II, learning disabilities 19.3% 20.4% z = 1.09, p = 0.28(c)
Axis III, intellectual disabilities (F70–F79) 1.3% 1.8% z = 1.50, p = 0.13(c)
Axis IV, epilepsy (G40) 1.3% 1.3% z = 0, p = 1.0(c)
  Mean (sd) MoBa Mean (sd) All  
Axis V, abnormal psychosocial situations (sum-score) 0.64 (0.89) 0.81 (1.01) t = 7.63, p < 0.001, d = -.18(a)
Axis VI, CGAS 55.0 (13.1) 52.4 (17.19 t = 7.93, p < 0.001, d = .17(a)
  1. NPR Norwegian patient registry, MoBa the Norwegian Mother and Child Cohort Study, CAMHS Child and Adolescent Mental Health Clinics, CGAS Children’s Global Assessment Scale. (a) One sample t-test (b) Wilcoxon (c) Binominal test for categorical variables