Table 1 Characteristics of articles included in analysis (N = 186)
From: Use of clustering analysis in randomized controlled trials in orthopaedic surgery
N | % | |
|---|---|---|
Multiple centers | 87 | 46.7 |
Multiple therapists | 145 | 78.0 |
Reported any clustering analysis | 40 | 21.5 |
Reported inclusion of a statistician on study team | 91 | 48.9 |
Report inclusion of a clinical trials methodologist or epidemiologist on study team | 83 | 44.6 |
Reported inclusion of either specialist | 109 | 58.6 |
Reported inclusion of both specialists | 65 | 34.9 |
Reported positive outcome | 94 | 50.5 |
Specified null hypothesis but reported positive outcome | 31 | 16.7 |
Reported negative outcome | 6 | 3.2 |
Reported neutral outcome | 86 | 46.2 |
Sample size (mean, SD) | 185 | 200.5, 344.8 |