highly significantP < 0.0001
The spline model still fit in a comparable way to the covariate-only model (AIC 195 850 vs 196 551; ΔAIC ≈ 702), and a LRT confirmed a highly significant nonlinear PM 2 . 5 –DFI relationship ( χ 2 4 = 709.6, P < 0.0001).
The spline model still fit in a comparable way to the covariate-only model (AIC 195 850 vs 196 551; ΔAIC ≈ 702), and a LRT confirmed a highly significant nonlinear PM 2 . 5 –DFI relationship ( χ 2 4 = 709.6, P < 0.0001).