Table 1 General characteristics of the 86 randomly selected cluster randomized trials published from August 2013 to July 2014
From: Statistical analysis and handling of missing data in cluster randomized trials: a systematic review
| Â | N (%) |
|---|---|
Stepped wedge | 4 (5) |
Pilot/feasibility | 4 (5) |
Type of outcome | Â |
 Quantitative | 41 (48) |
 Binary | 37 (43) |
 Count | 8 (9) |
How often outcome was collected | Â |
 Single | 21 (24) |
 Repeated | 65 (76) |
How outcome was treated in the primary analysis | Â |
 Single | 50 (58) |
 Repeated | 36 (42) |
Balance methods used in randomization | Â |
 Stratification | 27 (31)a |
 Matching | 14 (16) |
 Minimization | 3 (3) |
 None | 42 (49) |
 Presented sample size calculation | 60 (70) |