From: Statistical analysis and handling of missing data in cluster randomized trials: a systematic review
Methods | <10Â % missing | >10Â % missing | Unclear | Total |
---|---|---|---|---|
N = 14 | N = 58 | N = 8 | N = 80 | |
Complete case | 10 | 31 | 3 | 44 (55) |
Single imputation | Â | Â | Â | Â |
Worst-case | 1 | 2 | 0 | 3 (4) |
LOCF | 0 | 2 | 0 | 2 (2) |
Baseline observation carried forward | 0 | 1 | 0 | 1 (1) |
Multiple imputation | 0 | 2 | 0 | 2 (2) |
GEE (unweighted) | 3 | 0 | 1 | 4 (5) |
Mixed model/hierarchical/multilevel | 0 | 17 | 1 | 18 (22) |
Othera | 0 | 0 | 1 | 1 (1) |
Unclear | 0 | 3 | 2 | 5 (6) |