marginally significantP = 0.07
The effect of vitamin D status groups on WOMAC function was marginally significant ( P = 0.07); preoperative WOMAC function was lowest in the moderate-to-severe hypovitaminosis D group compared with the sufficient vitamin D group (MD −13.1, 95% CI −24.1 to −2.0) but was associated with the largest improvements over time (Table 2 ).