a nonsignificant trendp = 0.071
The addition of metabolic biomarkers in Model 2 significantly improved model fit (adjusted R 2 = 0.213, p < 0.001), with TG emerging as a negative predictor of 6MWD (β = −0.33, p < 0.001), while FBG showed a nonsignificant trend (β = −0.34, p = 0.071).