Association between long working hours and serum gamma-glutamyltransferase levels in female workers: data from the fifth Korean National Health and Nutrition Examination Survey (2010-2011)

Table 4 Associations between weekly working hours and high serum gamma-glutamyltransferase levels

Working hours/week	Crude		Model 1^*		Model 2^†
Working hours/week	OR^‡	95%CI^§	OR^‡	95%CI^§	OR^‡	95%CI^§
≤29	1.39	0.99–1.94	1.51	1.03–2.19	1.53	1.05–2.24
30–51	1		1		1
≥52	1.78	1.30–2.44	1.52	1.07–2.15	1.56	1.10–2.23

*Adjusted for general characteristics (i.e., age, BMI, alcohol consumption, smoking status and regular walking).
^†Adjusted for general and occupational characteristics (i.e., Model 1 + working type, and employment status).
^‡Odds ratio, ^§95% confidence interval.

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