Table 4.
Complete case bootstrap model selection for the outcome measure persistent disability
| most frequently selected models | rank | ||||||
|---|---|---|---|---|---|---|---|
| Predictors* | 1 | 2 | 2 | 4 | 5 | B | CCA |
| inability to perform daily activities | X | X | X | X | X | 1 | 1 |
| both shoulders afflicted | X | - | - | X | X | 2 | 3 |
| shoulder complaints in the past year | X | X | X | X | - | 3 | 2 |
| concomitant lower extremity pain | X | X | X | X | X | 4 | 5 |
| more disability at baseline | X | X | X | X | X | 5 | 6 |
| concomitant lower back pain | - | - | X | X | X | - | 4 |
| older age | - | - | - | - | - | - | - |
| longer duration of complaints | - | - | - | - | - | - | - |
| acute onset | - | - | - | - | - | - | - |
| Count | 33 | 23 | 23 | 22 | 16 | ||
| % | 6.6 | 4.6 | 4.6 | 4.4 | 3.2 | ||
* - only those predictors that appeared in ≥40% of the first bootstrap model selection step are presented
rank - the order of appearance of predictors in the derived models arranged by their predictive ability (regression coefficient estimates)
B - the complete case date based bootstrap selected model (i.e. the most frequently occurring combination of predictors in 500 replicate data sets of the second bootstrap model selection step)
CCA - the complete case data based model derived without additional bootstrap was the fourth most occurring combination of predictors in the bootstrap model selection procedure
Count - the number of times the model was selected in the 500 replicate data sets of the second bootstrap model selection step