Table 3.

Estimated Geometric Means and 95% Confidence Intervals of Urinary 6-Sulfatoxymelatonin (aMT6s) by Nightshift JEM Score Index in the Early Morning Urine Samples, SWHS, Shanghai, China

		Non-adjusted		Adjusted*
Nightshift JEM score index†	N	Geometric Mean (ng/mg Cr)	95% CI‡	Geometric Mean (ng/mg Cr)	95% CI‡
1	14	12.42	(8.03, 19.22)	8.36	(4.47, 15.63)
2	15	8.01	(5.25, 12.20)	6.37	(3.53, 11.46)
3	15	10.21	(6.70, 15.56)	6.20	(3.33, 11.52)
4	15	6.34	(4.16, 9.67)	3.81	(2.02, 7.19)
5	14	6.23	(4.03, 9.63)	3.70	(1.92, 7.11)
P for trend			0.11		0.05

^*Geometric mean of creatinine-adjusted 6-sulfatoxymelatonin (aMT6s) urinary concentration controlled for age (40-<50, 50-<60, and 60-70); education (college+, high school, and middle school and less), BMI (<=21.1, >21.1-<=22.9, >22.9-<=25.4, and >25.4), ever alcohol consumption (ever, never), menopausal status (pre- and post-menopausal), number of live births (0-1 and 2+ children), and urinary cortisol level (<=136.5, >136.5-<=197.9, >197.9-<=297.1, and >297.1 ng/mg Cr).

^†Nightshift JEM score index: 1 = never had a nightshift work job in lifetime, 2 = currently did not have a nightshift work job but had one or more in the past, 3 = current job had a nightshift JEM score of 1, 4 = current job had a nightshift JEM score of 2, through 5 = current job had a nightshift JEM score of 3.

^‡95% confidence interval.