highly significantp < 0.001
The test of moderators revealed a highly significant effect of region (Test of moderators, p < 0.001).
The test of moderators revealed a highly significant effect of region (Test of moderators, p < 0.001).
Nevertheless, this difference, akin to smoking status, failed to reach statistical significance (42.00 ± 56.60 vs. 32.10 ± 26.20 μg/m 3 ; Wilcoxon test, p = 0.918).