Table 5.
Results from the sensitivity analysis for Hedeker's data. The notation treatment/control in the Assumption column refers to the assumption made in the treatment and control groups, respectively
| β2 | β4 | β6 | β8 | Assumption | α (Standard error) | OR (95% CI) |
|---|---|---|---|---|---|---|
| – | – | – | – | MAR (ignoring X; section 3.3) | −0.35 (0.26) | 0.71 (0.43,1.17) |
| 0 | 0 | 0 | 0 | MAR (using X and Z) | −0.33 (0.25) | 0.72 (0.44, 1.18) |
| −∞ | +∞ | −∞ | +∞ | LOCF | −0.39 (0.22) | 0.68 (0.44, 1.03) |
| +∞ | +∞ | +∞ | +∞ | ‘Missing = smoking’ | −0.48 (0.25) | 0.62 (0.38, 1.01) |
| 0 | 0 | −∞ | +∞ | MAR/LOCF | −0.21 (0.23) | 0.81 (0.51, 1.28) |
| 0 | 0 | +∞ | +∞ | MAR/'missing = smoking’ | −0.74 (0.25) | 0.48 (0.29, 0.78) |
| −∞ | +∞ | 0 | 0 | LOCF/MAR | −0.51 (0.24) | 0.60 (0.38, 0.95) |
| −∞ | +∞ | +∞ | +∞ | LOCF/'missing = smoking’ | −0.92 (0.23) | 0.40 (0.25, 0.63) |
| +∞ | +∞ | 0 | 0 | ‘Missing = smoking'/MAR | −0.08 (0.25) | 0.93 (0.57, 1.52) |
| +∞ | +∞ | −∞ | +∞ | ‘Missing = smoking'/LOCF | 0.05 (0.23) | 1.05 (0.67, 1.65) |
MAR = missing at random; LOCF = last observation carried forward; OR = odds ratio; CI = confidence interval.