Table 3

Odds ratios (95% CI) for the association between total iron intake in first four months of life and type 1 diabetes.

Odds ratios (95% CI) for 1 SD increase in iron intake*

All participants

(128 cases and 67 controls)

Restricted to cases with a control sibling

(59 cases and 59 controls)

Total iron intake, SD units†

2.01 (1.183, 3.41)

2.26 (1.27, 4.03)

Age at recruitment, y

1.44 (1.07, 1.95)

1.69 (1.15, 2.49)

Birth weight, kg

1.09 (0.37, 3.27)

0.77 (0.24, 2.51)

Sibling rank

1.46 (0.62, 3.41)

2.17 (0.77, 6.08)

* Odds ratios are from conditional logistic regression models in which the 4 continuous variables were modeled simultaneously.

† Total iron intake from formula, supplements and breast milk. In the total sample (n = 195) one SD unit was 540 mg while it was 539 mg in the restricted sample (n = 118).

Ashraf et al. Diabetology & Metabolic Syndrome 2010 2:58   doi:10.1186/1758-5996-2-58