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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

From: A comparison of methods to estimate the survivor average causal effect in the presence of missing data: a simulation study

  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