Table 3

Distribution of 10 264 cases of schizophrenia and 50.7 million person-years at risk in a population-based cohort of 2.66 million Danish people

Variable Cases (n) Person-years
Gender
Male 6933 26 878 929
Female 3331 23 819 726
Maternal history
Schizophrenia 275 158 832
Schizophrenia-like psychoses 298 354 807
Other mental disorders 1606 3 718 334
Mother not affected 8085 46 466 682
Paternal history
Schizophrenia 107 92 711
Schizophrenia-like psychoses 118 177 980
Other mental disorders 1072 2 880 251
Father not affected 8075 45 858 837
History in siblings
Schizophrenia 319 129 561
Schizophrenia-like psychoses 134 97 902
Other mental disorders 625 908 315
No affected siblings 9186 49 562 876
Place of birth
Capital 3210 8 926 711
Capital suburb 958 4 552 162
Provincial cities 1300 6 429 845
Provincial towns 2911 17 440 193
Rural area 1885 13 349 744
Study population
A: ICD-8, mother born in Denmark 1935 or later 2684 24 551 052
B: ICD-10, mother born in Denmark 1935 or later 2452 8 971 004
C: ICD-8, mother born in Denmark pre-1935 or outside Denmark 3924 14 045 119
D: ICD-10, mother born in Denmark pre-1935 or outside Denmark 1204 3 131 480
Total 10 264 50 698 655