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

BMC Public Health

Table 1 Demographic characteristics of the study cohort

Variables	No. of subjects	Follow-up person-years	No. of death from brain cancer	Mortality Rate (per 100,000 person-years)
Age at recruitment (1^st 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

ISSN: 1471-2458