Table 4.
Estimated Effect of Vitamin D Supplementation on Physical Performance
| Outcome | Estimated Yearly Change (95% CI) | Direction of Change | Effect of Vitamin D Supplementation on Yearly Change (95% CI) a | P b |
|---|---|---|---|---|
| Grip strength | −1.68 (−2.1 to −1.3) | Decline | −0.048 (−0.56 to 0.46) | 0.85 |
| Grip strength/BMI | −0.05 (−0.06 to −0.04) | Decline | −0.004 (−0.02 to 0.02) | 0.71 |
| SPPB | 0.13 (0.02 to 0.24) | Increase | −0.05 (−0.19 to 0.09) | 0.51 |
| 6MWT | −0.005 (−0.02 to 0.01) | Stable | −0.005 (−0.02 to 0.01) | 0.60 |
Abbreviation: BMI, body mass index.
a
Based on the interaction between treatment group and time in a repeated measures linear model containing treatment group, time, and the interaction between treatment group and time.
b
Z test for the estimated interaction effect between treatment group and time.