marginally significantP = 0.091
After adjusting for BMI and year, the group effect of Health group vs Osteoporosis group became marginally significant under both Bray–Curtis and Jaccard measures (Bray: R2=0.201, F = 2.78, P = 0.091; Jaccard: R2=0.102, F = 1.35, P = 0.061), with neither covariate significant (BMI: P = 0.950; year: P = 0.226).