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Table 1 Demographic characteristics of the study cohort

From: Parity, age at first birth, and risk of death from brain cancer: a population-based cohort study in Taiwan

Variables No. of subjects Follow-up person-years No. of death from brain cancer Mortality Rate (per 100,000 person-years)
Age at recruitment (1st birth)   
≤ 20 158,292 4,544,456.00 30 0.66
21-25 701,650 19,032,158.50 164 0.86
> 25 432,520 11,403,631.50 122 1.07
Parity     
1 157,207 4,170,772.33 55 1.32
2 564,727 15,124,112.33 142 0.94
3+ 570,528 15,685,361.33 119 0.76
Marital status     
Married 1,260,615 34,115,479.25 309 0.91
Not married 31,847 864,766.75 7 0.81
Years of schooling    
≤ 9y 722,518 19,850,938.17 176 0.89
> 9y 569,944 15,129,307.83 140 0.93
Birth place     
Hospital / clinic 1,245,925 33,638,862.83 303 0.90
Home / other 46,537 1,341,383.17 13 0.97