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Table 2 Characteristics of the study population (N = 3253)

From: A new measure for infant mental health screening: development and initial validation

  Participants Non-participants  
% (n) % (n) p-value (missing)
Sex
 Boys 51.7 (1538) 51.4 (144)  
 Girls 48.3 (1435) 48.6 (136) .93 (0)
Gestational age
  < 28 weeks 0.1 (2) 0.0 (0)  
 28-31 weeks 0.7 (19) 0.4 (1)  
 32-36 weeks 5.1 (144) 4.5 (12)  
  > = 37 weeks 94.2 (2680) 95.1 (254) .88 (141)
Birth weight
  < 1500 g 0.4 (11) 0.4 (1)  
 1500 - <2500 g 4.2 (119) 2.7 (7)  
  > = 2500 g 95.5 (2738) 97.0 (256) .50 (121)
Neonatal complications
 Yes 21.3 (632) 22.5 (63)  
 No 78.7 (2341) 77.5 (217) .63 (0)
Apgar score
  < 10 5.8 (166) 4.5 (12)  
  > = 10 94.2 (2697) 95.5 (254) .39 (124)
Parental factors
Mother smoking in pregnancy
 Yes 12.2 (350) 14.9 (39)  
 No 87.8 (2510) 85.1 (222) .21 (132)
Parent young at child birth
  < 20 years 0.4 (11) 0.0 (0)  
  > = 20 years 99.6 (2886) 100.0 (270) .31 (86)
Parent born outside Scandinavia
 Yes 27.2 (808) 48.9 (137)  
 No 72.8 (2165) 51.1 (143) .0001 (0)
Parent more than 10 years of schooling
 No 9.5 (175) 18.3 (28)  
 Yes 90.5 (1672) 81.7 (125) .0005 (1253)
Parents living together at child birth
 No 7.3 (206) 8.4 (21) .55 (192)
 Yes 92.7 (2604) 91.6 (230)  
Mother mental health problems
 Yes 27.1 (685) 23.9 (53)  
 No 72.9 (1843) 76.1 (169) .30 (503)
Mother-child relationship problems
 Yes 8.7 (221) 13.5 (30)  
 No 91.3 (2313) 86.6 (193) .02 (496)