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Table 2 Prevalence of overweight/obesity and obesity according to current shift work and tertile of shift work duration

From: Association between shift work and obesity among female nurses: Korean Nurses’ Survey

Variables Total Current shift work P-value Tertile of shift work duration Pfor trend
No Yes Tertile 1 Tertile 2 Tertile 3
  (n = 9,989) (n = 4,702) (n = 5,287)   (n = 1,732) (n = 1,731) (n = 1,686)  
BMI category               
 < 23 kg/m2 8134 (81.4) 3578 (76.1) 4556 (86.2) <0.001 1593 (92.0) 1546 (89.3) 1300 (77.1) <0.001
 ≥ 23 kg/m2 a 1855 (18.6) 1124 (23.9) 731 (13.8) 139 (8.0) 185 (10.7) 386 (22.9)
BMI category               
 < 25 kg/m2 9253 (92.6) 4274 (90.9) 4979 (94.2) <0.001 1678 (96.9) 1647 (95.1) 1524 (90.4) <0.001
 ≥ 25 kg/m2 b 736 (7.4) 428 (9.1) 308 (5.8) 54 (3.1) 84 (4.9) 162 (9.6)
  1. Data are expressed as n (%) and tested by chi-square test.
  2. aOverweight and obesity combined.
  3. bObesity.