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. 2016 Feb 9;17:72. doi: 10.1186/s13063-016-1201-z

Table 5.

Primary analysis in 86 cluster randomized trials

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)

Abbreviations: GLM, generalized linear model; GEE, generalized estimating equation

aThe denominator is the total number of trials performing respective primary analysis

bOne trial was unclear

cTrial used a descriptive analysis as primary analysis