Table 2 Standardised difference between exposure groups for 20,321 participants of the Melbourne Collaborative Cohort Study with non-missing data on age-related macular degeneration status
| Â | Iron Intake | Standardised difference | ||
|---|---|---|---|---|
High | Low | Unweighted | Weighted | |
Mean age at follow-up (years) | 64.1 | 64.0 | −0.02 | − 0.01 |
Sex | ||||
 Male | 39.7 | 40.0 | 0.01 | 0.01 |
 Female | 60.3 | 60.0 | −0.01 | 0.00 |
Smoking status (baseline) | ||||
 Never-smoker | 57.1 | 63.4 | 0.13 | 0.00 |
 Former-smoker | 33.3 | 29.3 | −0.09 | −0.02 |
Current smoker | ||||
 Smoker 1–14 cigarettes/day | 3.6 | 2.9 | −0.04 | −0.01 |
 Smoker > 14 cigarettes/day | 5.9 | 4.4 | −0.07 | 0.03 |
Education (baseline) | ||||
 Less than high/technical school | 52.1 | 44.4 | −0.16 | 0.01 |
 High/technical school | 14.0 | 14.7 | 0.02 | −0.01 |
 Trade, tertiary degree or diploma | 34.0 | 41.0 | 0.15 | 0.00 |
Country of birth | ||||
 Northern European | 80.6 | 91.2 | 0.31 | 0.04 |
 Southern European | 19.4 | 8.8 | −0.31 | −0.04 |
Physical activity quartile (baseline) | ||||
 1 (Least active) | 22.5 | 16.5 | −0.15 | −0.04 |
 2 | 22.4 | 22.3 | 0.00 | 0.03 |
 3 | 24.9 | 25.5 | 0.01 | 0.01 |
 4 (Most active) | 30.2 | 35.7 | 0.12 | 0.00 |