Response model | Set of variables | Description |
---|---|---|
1 | X, Z1, Z2, Z3, Z4 | All variables associated with the responsea |
2 | X, Z1, Z2, Z3, Z4, Z5, Z6, Z7 | The exposure variable X and all covariates |
3 | X, Z1, Z3 | The exposure variable X and variables associated with both response and outcome (strategy proposed by Hernan et al. [3]) |
4 | X, Z1, Z2, Z3, Z5, Z7 | All variables associated with the response*, except Z4 only associated with the response; Adding Z5 a confounding variable (Z5) and a prognostic variable (Z7), neither associated with the response (strategy proposed by Seaman and White [4]) |
5 | X, Z1 | The exposure variable X and the confounding variable associated with the response (Z1) |
6 | X, Z5 | The exposure variable X and the confounding variable not associated with the response (Z5) |
7 | X, Z1, Z5 | The exposure variable X and both confounding variables, that associated with the response (Z1) the other not (Z5) |
8 | X, Z1, Z5, Z7 | The exposure variable X, both confounding variables (Z1, Z5) and a prognostic variable not associated with the response (Z7) |
9 | X, Z5, Z7 | The exposure variable X and a confounding variable and prognostic variable, neither associated with the response (Z5, Z7) |
10 | Z1, Z2, Z3, Z4 | Previous response models without the exposure variable X |
11 | Z1, Z2, Z3, Z4, Z5, Z6, Z7 | |
12 | Z1, Z3 | |
13 | Z1, Z2, Z3, Z5, Z7 | |
14 | Z1 | |
15 | Z5 | |
16 | Z1, Z5 | |
17 | Z1, Z5, Z7 | |
18 | Z5, Z7 |