From: Age at first birth and long-term mortality for mothers: the Ohsaki cohort study
Age at first birth (years) | ||||
---|---|---|---|---|
≤19 | 20–24 | 25–29 | ≥30 | |
(n = 492) | (n = 13,551) | (n = 5,589) | (n = 891) | |
Person-years | 5,345 | 153,218 | 64,423 | 9,880 |
All-cause | ||||
No. of deaths | 70 | 1,296 | 581 | 117 |
Crude HR (95% CI) | 1.56 (1.23–1.98) | 1.00 (referent) | 1.06 (0.96–1.17) | 1.41 (1.16–1.70) |
p-value | <0.01 | 0.22 | <0.01 | |
Age at baseline adjusted HR (95% CI) | 1.30 (1.02–1.66) | 1.00 (referent) | 1.03 (0.93–1.13) | 1.33 (1.10–1.60) |
p-value | 0.03 | 0.59 | <0.01 | |
Multivariate HRa (95% CI) | 1.12 (0.87–1.44) | 1.00 (referent) | 1.07 (0.96–1.18) | 1.35 (1.10–1.66) |
p-value | 0.39 | 0.21 | <0.01 | |
Cancer | ||||
No. of deaths | 19 | 363 | 167 | 35 |
Crude HR (95% CI) | 1.51 (0.95–2.39) | 1.00 (referent) | 1.09 (0.91–1.31) | 1.50 (1.06–2.12) |
p-value | 0.08 | 0.34 | 0.02 | |
Age at baseline adjusted HR (95% CI) | 1.37 (0.86–2.18) | 1.00 (referent) | 1.06 (0.88–1.27) | 1.44 (1.02–2.04) |
p-value | 0.18 | 0.55 | 0.04 | |
Multivariate HRa (95% CI) | 1.17 (0.71–1.90) | 1.00 (referent) | 1.09 (0.90–1.32) | 1.50 (1.04–2.18) |
p-value | 0.54 | 0.37 | 0.03 | |
CVD | ||||
No. of deaths | 24 | 444 | 178 | 36 |
Crude HR (95% CI) | 1.56 (1.04–2.35) | 1.00 (referent) | 0.95 (0.80–1.13) | 1.26 (0.90–1.77) |
p-value | 0.03 | 0.57 | 0.18 | |
Age at baseline adjusted HR (95% CI) | 1.24 (0.82–1.87) | 1.00 (referent) | 0.92 (0.78–1.10) | 1.19 (0.84–1.67) |
p-value | 0.30 | 0.37 | 0.33 | |
Multivariate HRa (95% CI) | 1.03 (0.67–1.59) | 1.00 (referent) | 0.92 (0.77–1.11) | 1.10 (0.76–1.60) |
p-value | 0.39 | 0.61 | 0.69 | |
Other | ||||
No. of deaths | 27 | 489 | 236 | 46 |
Crude HR (95% CI) | 1.60 (1.08–2.35) | 1.00 (referent) | 1.14 (0.98–1.34) | 1.47 (1.09–1.99) |
p-value | 0.02 | 0.09 | 0.01 | |
Age at baseline adjusted HR (95% CI) | 1.29 (0.87–1.90) | 1.00 (referent) | 1.11 (0.95–1.29) | 1.38 (1.02–1.86) |
p-value | 0.20 | 0.20 | 0.04 | |
Multivariate HRa (95% CI) | 1.14 (0.76–1.70) | 1.00 (referent) | 1.20 (1.02–1.41) | 1.49 (1.07–2.07) |
p-value | 0.52 | 0.03 | 0.02 |