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Table 1 Demographic characteristics of cases and controls

From: Advanced paternal age is a risk factor for schizophrenia in Iranians

  Cases (%) Controls (%) P value
Sex:
Male 62.7 61.8 0.84a
Female 37.3 38.2  
Education:
Illiterate 3.6 5 0.87a
Lower than diploma level 48.2 49.5  
Diploma 39.5 35.5  
Higher than diploma 86 10  
Paternal age at parturition (mean ± SD) 30.5 ± 6.2 26.4 ± 5.6 0.001b
Maternal age at parturition (mean ± SD) 25 ± 4.5 26.1 ± 5.4 0.02c
Familial history of major psychiatric disorder:    
Yes 45(20.5%) 29(13.2%) 0.041a
No 155(79.5%) 171(86.8%)  
Birth rank    
1 48 (21.8) 61 (27.7) 0.037b
2 95 (43.2) 106 (48.2)  
≥3 77 (35%) 53 (24.1)  
  1. P values < 0.05 were considered statistically significant.
  2. aχ2 test; bMann-Whitney U test; ct test.