Table 2. Testing the 2-Phase Model Fit for Association of Radial Inclination, Ulnar Variance, and Tilt With Patient Outcomesa.
| Outcome Variable by Age Groupb | Radial Inclination | Ulnar Variance | Tilt | |||
|---|---|---|---|---|---|---|
| Slope Difference (95% CI)c | P Value | Slope Difference (95% CI)c | P Value | Slope Difference (95% CI)c | P Value | |
| Grip strength difference | ||||||
| Younger | −0.15 (−0.8 to 0.51) | .66 | 2.45 (−1.60 to 6.50) | .24 | −0.13 (−1.18 to 0.93) | .82 |
| Older | 1.00 (0.28 to 1.72) | .01 | 1.08 (−1.78 to 3.94) | .46 | 0.33 (−0.54 to 1.21) | .46 |
| Arc of motion difference | ||||||
| Younger | −0.46 (−2.59 to 1.67) | .68 | 5.08 (−8.74 to 18.91) | .47 | 1.73 (−1.55 to 5.01) | .31 |
| Older | 3.12 (−0.17 to 6.41) | .07 | −11.37 (−25.28 to 2.54) | .12 | 0.65 (−3.33 to 4.64) | .75 |
| Radial deviation difference | ||||||
| Younger | 0.30 (−0.58 to 1.18) | .51 | −0.26 (−5.98 to 5.47) | .93 | −1.19 (−2.55 to 0.17) | .09 |
| Older | −0.45 (−2.32 to 1.41) | .64 | −0.003 (−7.40 to 7.39) | >.99 | 0.51 (−1.75 to 2.78) | .66 |
| Ulnar deviation difference | ||||||
| Younger | −0.35 (−1.25 to 0.56) | .46 | 1.65 (−4.29 to 7.58) | .59 | −0.14 (−1.55 to 1.26) | .84 |
| Older | 0.85 (−1.04 to 2.74) | .38 | −2.99 (−10.47 to 4.49) | .44 | 0.52 (−1.77 to 2.81) | .66 |
| MHQ total score difference | ||||||
| Younger | −2.55 (−4.45 to −0.64) | .01 | 11.34 (−1.07 to 23.75) | .08 | 2.02 (−0.92 to 4.97) | .18 |
| Older | −1.21 (−3.91 to 1.49) | .38 | −7.35 (−18.05 to 3.35) | .18 | −0.70 (−3.98 to 2.58) | .68 |
| MHQ function score difference | ||||||
| Younger | 1.05 (−1.17 to 3.27) | .36 | 5.01 (−9.47 to 19.50) | .50 | −2.64 (−6.08 to 0.80) | .14 |
| Older | 2.93 (−0.95 to 6.81) | .15 | 11.12 (−4.24 to 26.47) | .16 | 0.35 (−4.35 to 5.05) | .88 |
| MHQ ADL score difference | ||||||
| Younger | −0.13 (−1.60 to 1.34) | .87 | 4.39 (−5.21 to 13.99) | .37 | −2.01 (−4.32 to 0.24) | .08 |
| Older | 0.53 (−1.10 to 2.16) | .53 | 11.02 (4.57 to 17.47) | .001 | 0.61 (−1.37 to 2.58) | .55 |
Abbreviations: ADL, activities of daily living; MHQ, Michigan Hand Outcomes Questionnaire.
Covariates included in the model are sex, race, highest educational level, income, smoking status, preinjury level of activity, employment status 12 months following treatment, and status of dominant-hand injury.
Age group defined by median age (70 years): age 60 to 69 as the younger group and 70 years or older as the older group.
The slope difference is slope 1 minus slope 2, where slope 1 was calculated from data points with radial inclination less than or equal to 22°, ulnar variance less than or equal to 0 mm, or tilt less than or equal to 11°; and slope 2 from those with radial inclination greater than 22°, ulnar variance greater than 0 mm, or tilt greater than 11°.