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. 2022 Apr-Jun;15(2):143–148. doi: 10.5935/1984-0063.20220034

Table 2.

Analysis of delta cortisol, delta melatonin and sleep-related variables between day-shift and night-shift workers in southern Brazil (n=36).

Variables Day-shift Night-shift p-value
Sleep duration, working day
Raw
6.66 (6.22; 7.15) 3.68 (3.07; 4.41) 0.000
Adj 6.42 (5.91; 6.87) 3.94 (3.32; 4.65) 0.000
Midpoint of sleep, working day
Raw 2.98 (2.64; 3.4) 11.16 (9.84; 12.14) 0.000
Adj 3.47 (2.79; 4.8) 10.74 (8.84; 12.18) 0.000
Sleep duration, free day
Raw 8.65 (8.03; 9.35) 7.57 (6.61; 8.4) 0.072
Adj 9.2 (8.4; 10.17) 6.97 (5.68; 8.14) 0.003
Midpoint of sleep, free day
Raw 4.07 (3.7; 4.44) 4.3 (3.55; 5.00) 0.554
Adj 4.26 (3.73; 4.73) 4.19 (3.39; 4.87) 0.896
Jet lag
Raw
>1.17 (0.64; 1.59) -6.21 (-8.08;-3.76) >0.000
Adj 0.97 (-0.21; 1.74) -6 (-7.83;-3.89) 0.000
Delta cortisol
Raw
>0.76 (0.55; 1) 0.37 (-0.03; 0.81) >0.121
Adj 0.56 (0.32; 0.8) 0.56 (0.16; 1.01) 0.986
Delta melatonina
Raw
>3.68 (-3.33; 11.39) -2.42 (-10.02; 3.02) >0.249
Adj 6.91 (-1.15; 17.63) -5.18 (-14.65; 2.38) 0.075

Notes: Raw: Results by Student t-test; Adj: Results by ANCOVA adjusted by alcohol; 95%CI obtained with 1,000 bootstrap resamples.