The search for stable prognostic models in multiple imputed data sets

Table 3 Complete case and multiple imputed model compositions for the outcome measure persistent shoulder pain intensity

	missing values	CCA	MI-5
		rank	rank
persistent shoulder pain intensity*	76 (12.9%)
sporting injury	0 (0%)	1	1
concomitant lower back pain	0 (0%)	2	3
longer duration of complaints	1 (0.2%)	3	2
both shoulders afflicted	0 (0%)	4	4
inability to perform daily activities	8 (1.4%)	5	5
concomitant upper extremity pain	0 (0%)	6	6
sporting activities	0 (0%)	7
higher physical workload	0 (0%)	8

CCA - complete case analysis
MI -5 - multiple imputation using 5 imputation files
rank - the order of appearance of predictors in the derived model arranged by their predictive ability (regression coefficient)
% - inclusion frequency; the proportion of times that a variable with a univariable association with the outcome is retained in the automated backward selected models. When a variable was selected in each of the replications, the inclusion frequency was 100%
* - outcome measure

ISSN: 1471-2288