Nocturnal sentry duty and cardiometabolic characteristics in armed forces personnel

Table 1 Clinical characteristics of military participants classified by night sentry duty frequency

	Night sentry duty 0/month (n = 506)	Night sentry duty 1-2/month (n = 220)	Night sentry duty ≥ 3/month (n = 141)	P value
Age (years)	28.01 ± 6.21	28.71 ± 5.90	28.89 ± 5.82	0.17
Male, n (%)	434 (85.8)	199 (90.5)	129 (91.5)	0.07
Substance use, n (%)
Alcohol drinking	208 (41.1)	87 (39.5)	45 (31.9)	0.14
Betel nut chewing	74 (14.6)	35 (15.9)	11 (7.8)	0.07
Cigarette smoking	252 (49.8)	108 (49.1)	51 (36.2)	0.01
Time for a 3000-m run (seconds)	906.65 ± 134.39	905.29 ± 161.73	922.10 ± 101.86	0.46
Body mass index (kg/m2)	24.69 ± 3.99	24.57 ± 3.76	24.59 ± 3.28	0.91
Systolic BP (mmHg)	117.40 ± 14.30	117.45 ± 12.34	116.97 ± 12.52	0.93
Diastolic BP (mmHg)	69.47 ± 11.00	69.73 ± 9.11	70.27 ± 9.21	0.71
Pulse pressure (mmHg)	47.93 ± 10.55	47.72 ± 9.58	46.69 ± 9.82	0.44
Pulse rate (bpm)	73.34 ± 10.87	72.22 ± 10.68	75.03 ± 9.24	0.04
Blood test
Total cholesterol (mg/dL)	171.21 ± 31.43	174.28 ± 35.25	171.64 ± 31.12	0.49
LDL-C (mg/dL)	104.65 ± 28.65	107.03 ± 31.02	106.98 ± 29.69	0.50
HDL-C (mg/dL)	50.80 ± 10.88	50.35 ± 10.71	48.43 ± 9.96	0.07
Serum triglycerides (mg/dL)	100.39 ± 83.01	108.85 ± 72.47	106.06 ± 82.73	0.39
Fasting glucose (mg/dL)	94.28 ± 9.15	95.09 ± 10.74	95.09 ± 9.10	0.47
Echocardiographic parameters1
LVMI (g/m2)	73.76 ± 11.91	76.00 ± 14.85	77.46 ± 13.78	0.20
LVEF (%)	61.43 ± 4.85	62.30 ± 4.93	62.81 ± 4.65	0.14
LA diameter (mm)	32.60 ± 4.48	32.65 ± 4.44	33.70 ± 4.12	0.38

¹Participant numbers for night sentry duty: 0/month, 1-2/month, and ≥ 3/month were 154, 83 and 43, respectively, and echocardiographic parameters were compared with adjustments for age, sex and systolic blood pressure.

BP: Blood pressure; HDL-C: High-density lipoprotein cholesterol; LDL-C: Low-density lipoprotein cholesterol; LA: Left atrium; LVEF: Left ventricular ejection fraction; LVMI: Left ventricular mass index.