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. 2020 May 29;20:134. doi: 10.1186/s12874-020-01018-7

Table 2.

Breakdown of the number of individuals with missing data

Description Number (%)
Excluded missing data in initial phase (N=106)
Excluded individuals with missing data in any covariate1 44 (42)
Excluded individuals with missing data in a subset of covariates 62 (58)
Reported the number of individuals excluded 66 (62)
Percentage (%) of individuals excluded (n=66)
Mean (SD) 14.14 (12.40)
Median (IQR) 10.22 (4.73, 18.34)
Min, Max 0.11 47.38
Missing data present for the analysis stage (N=102)
Reported missing data in baseline table for incomplete covariates 82 (80)
Used a complete-case analysis2 35 (34)
Used other missing data methods 36 (35)
Quantified the complete-case sample size 25 (25)
Percentage (%) of individuals excluded (n=25)
Mean (SD) 31.65 (21.90)
Median (IQR) 31.34 (13.67, 37.76)
Min, Max 1.77 94.16

The initial phase is the stage when defining the study population using inclusion and exclusion criteria.

1potentially used a complete-case in initial phase but did not clearly state their methods

2A further 31 were not clear on whether they used a complete-case during the analysis