Blood Donation, Being Asian, and a History of Iron Deficiency Are Stronger Predictors of Iron Deficiency than Dietary Patterns in Premenopausal Women

Table 2

Results of stepwise multiple logistic regression identifying determinants of suboptimal iron status.

Variable	OR^a	95.0% CI for OR	𝑃 value
Any blood donation in the past year	6.00	2.81, 12.82	<0.001
Asian ethnicity	4.84	2.29, 10.20	<0.001
Previous iron deficiency	2.19	1.16, 4.13	0.016
Milk and yoghurt dietary pattern (SD)	1.44	1.08, 1.93	0.012
Duration of menstrual period (d)	1.38	1.12, 1.68	0.002
Meat and vegetable dietary pattern (SD) × having children	0.17	0.08, 0.39	<0.001

aChange in odds of suboptimal iron status occurring for each unit change in determinant variable. If >1.0, as determinant variable increases, odds of suboptimal iron status increase. If <1.0, as determinant variable increases, odds of suboptimal iron status decrease.
𝑅²=0.22 (Hosmer and Lemeshow), 0.19 (Cox and Snell), and 0.31 (Nagelkerke). Model 𝜒²=79.32.
CI: confidence interval; d: days; OR: odds ratio; SD: standard deviation.