Table 4.
Summary of Results from Resampling with Replacement (10,000 samples per sample size condition)
| Samples of 25 | Samples of 50 | Samples of 75 | ||||
|---|---|---|---|---|---|---|
| Mean Differences | Standard Deviation of Mean Differences | Mean Differences | Standard Deviation of Mean Differences | Mean Differences | Standard Deviation of Mean Differences | |
| BPI-PI to PROMIS-PI | ||||||
| IRT pattern scoring | −0.004 | 0.787 | −0.010 | 0.553 | −0.013 | 0.445 |
| IRT crosswalk | 0.184 | 0.792 | 0.190 | 0.539 | 0.188 | 0.438 |
| EQP raw-scale SM=0.0 | 0.264 | 0.815 | 0.278 | 0.570 | 0.269 | 0.453 |
| EQP raw-scale SM=0.3 | 0.173 | 0.789 | 0.180 | 0.563 | 0.179 | 0.450 |
| EQP raw-scale SM=1.0 | 0.135 | 0.795 | 0.126 | 0.547 | 0.119 | 0.441 |
| SF36-BP to PROMIS-PI | ||||||
| IRT pattern scoring | −0.149 | 0.923 | −0.177 | 0.629 | −0.169 | 0.506 |
| IRT crosswalk | −0.144 | 0.931 | −0.127 | 0.654 | −0.123 | 0.522 |
| EQP raw-scale SM=0.0 | −0.105 | 0.962 | −0.099 | 0.657 | −0.090 | 0.530 |
| EQP raw-scale SM=0.3 | 0.723 | 1.069 | 0.707 | 0.741 | 0.730 | 0.602 |
| EQP raw-scale SM=1.0 | 0.959 | 1.131 | 0.966 | 0.759 | 0.962 | 0.615 |
BPI-PI = Brief Pain Inventory Pain Interference; PROMIS-PI = Patient Reported Outcomes Measurement Information System Pain Interference; SF-36 = Short Form-36 Bodily Pain; IRT = item response theory; EQP = equipercentile.