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Table 5 Primary analysis in 86 cluster randomized trials

From: Statistical analysis and handling of missing data in cluster randomized trials: a systematic review

 

Accounted for clusteringa

Total

Primary Analysis

Yes

No

N (%)

N (%)

N (%)

Individual level:

   

Basic inferential test/GLM

7 (32)

15 (68)

22 (26)

GEE

14 (100)

0 (0)

14 (16)

Mixed model

43 (96)

2 (4)b

45 (52)

Otherc

0 (0)

1 (100)

1 (1)

Cluster level:

   

Basic inferential test/GLM

4 (100)

0 (0)

4 (5)

  1. Abbreviations: GLM, generalized linear model; GEE, generalized estimating equation
  2. aThe denominator is the total number of trials performing respective primary analysis
  3. bOne trial was unclear
  4. cTrial used a descriptive analysis as primary analysis
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Trials

ISSN: 1745-6215