Table 4.
Multivariable adjusted hazard ratio (HR) with 95 % confidence limits (CI) for the dose of iron supplements and the risk of total mortality in women aged 55–69 years at baseline from the IOWA Women’s Health Study
| Dose of iron supplement (mg d–1) | Cases | HR xx | Cases | HR (95 % CI) | Cases | HR (95 % CI) | Cases | HR (95 % CI) | Cases | HR (95 % CI) |
|---|---|---|---|---|---|---|---|---|---|---|
| Non-users | > 0–50 | > 50–200 | > 200–400 | > 400 | ||||||
| Follow-up period | ||||||||||
| 1986–2008 | 13 801 | 1 | 527 | 1.02 (0.93–1.12) | 222 | 1.08 (0.94–1.24) | 118 | 1.35 (1.12–1.63) | 47 | 1.57 (1.17–2.11) |
| 1986–1996 | 3675 | 1 | 144 | 1.09 (0.92–1.30) | 59 | 1.12 (0.86–1.46) | 37 | 1.41 (1.01–1.96) | 16 | 1.70 (1.02–2.83) |
| 1997–2003 | 2943 | 1 | 115 | 1.13 (0.92–1.39) | 74 | 1.69 (1.33–2.14) | 59 | 1.30 (0.97–1.74) | 14 | 1.91 (1.06–3.45) |
| 2004–2008 | 1913 | 1 | 71 | 1.66 (1.28–2.14) | 71 | 1.85 (1.43–2.39) | 58 | 1.67 (1.25–2.22) | 17 | 2.01 (1.19–3.40) |