Nocturnal sentry duty and cardiometabolic characteristics in armed forces personnel

Table 4 Associations of night sentry duty frequency categories with metabolic syndrome and related features

	Hypertension	Central obesity	Reduced HDL-C	Increased TG	Impaired FPG	Metabolic syndrome
No night duty (reference)	1.000	1.000	1.000	1.000	1.000	1.000
Night duty ≥ 1/month	1.094 (0.758-1.579)	1.110 (0.676-1.823)	1.111 (0.741-1.665)	1.487 (0.980-2.256)	1.415 (1.016-1.969)a	1.464 (0.873-2.456)
No night duty (reference)	1.000	1.000	1.000	1.000	1.000	1.000
Night duty 1-2/month	1.084 (0.706-1.663)	0.991 (0.551-1.782)	1.057 (0.657-1.701)	1.804 (1.131-2.879)a	1.481 (1.013-2.167)a	1.755 (0.984-3.130)
Night duty ≥ 3/month	1.109 (0.678-1.816)	1.311 (0.672-2.555)	1.198 (0.695-2.066)	1.053 (0.580-1.911)	1.316 (0.839-2.062)	1.059 (0.509-2.202)

^aP < 0.05.

Definitions: Hypertension was defined as systolic blood pressure ≥ 130 mmHg and/or diastolic blood pressure ≥ 85 mmHg; central obesity was defined as waist circumference ≥ 90 cm in men and ≥ 80 cm in women; reduced high-density lipoprotein was defined as < 40 mg/dL in men and < 50 mg/dL in women; increased serum triglycerides was defined as ≥ 150 mg/dL; impaired fasting plasma glucose was defined as ≥ 100 mg/dL; metabolic syndrome was defined as having 3 or more of the above five features. Data are presented as odds ratio (OR) and confidence interval using multiple logistic regression analysis with adjustments for age, sex, alcohol drinking, betel nut chewing, cigarette smoking, body mass index and time for a run adjustment. FPG: Fasting plasma glucose; HDL-C: High-density lipoprotein cholesterol; TG: Serum triglycerides.