Table 2.

Pairwise comparisons of 6-sulfatoxymelatonin mesor and acrophase between day and night rotations among shift workers, stratified by chronotype

Cosinor parameters (95% CI)
Geometric mean mesor (ng/mg)Geometric mean acrophase (hh:mm)
NDay rotationNight rotationDay rotationNight rotation
Shift workers11415.2 (13.7, 16.7)13.6 (11.3, 15.9)a4:31 (4:17, 4:45)3:43 (3:20, 4:06)a
Chronotype
 Early3814.3 (12.0, 16.6)14.4 (9.9, 18.9)4:47 (2:06, 5:58)4:01 (21:44, 5:58)
 Middle3815.5 (12.5, 18.5)12.1 (9.7, 14.4)a4:31 (0:03, 5:57)3:54 (22:03, 5:51)a
 Late3815.9 (13.3, 18.6)14.4 (9.5, 19.2)a4:14 (1:09, 5:55)3:14 (20:53, 5:59)a
  • aP < 0.05 using the Wilcoxon signed-rank test for matched data.