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Table 2 Age adjusted mortality rate ratios (MRR) bias for the four models. All results are the mean taken over the 10 000 simulations

From: Bias in cohort-based comparisons of immigrants’ health outcomes between countries: a simulation study

Model

Observed deaths* (% of all obs.)

Observed RM*

Censored observations*

MRR Bias (SD)

a. unadj., b. adj.**

Model 1

 

3 458 (17%)

16 621

a. 1.063 (0.009)

2 829 (17%)

13 024

b. 1.000 (0.008)

Model 2

 

3 348 (15%)

892

15 838

a. 0.944 (0.007)

2 725 (17%)

892

15 156

b. 0.995 (0.008)

Model 3

 

3 383 (17%)

464

16 233

a. 1.085 (0.011)

2 829 (17%)

464

12 197

b. 0.977 (0.010)

Model 4

 

2 888 (12%)

1 240

15 950

a. 0.915 (0.013)

1 814 (14%)

1 240

11 900

b. 0.837 (0.011)

  1. *The values in italics are for the population with return migration observed
  2. **Adjusted for income and education level