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Table 1 Demographic, occupational, health, and work-related psychosocial characteristics of study participants and bivariate associations between these factors and years worked at night among women ( n  = 2,100)

From: Years worked at night and body mass index among registered nurses from eighteen public hospitals in Rio de Janeiro, Brazil

  All ( n  = 2,100) Years worked at night p -value
<1 ( n  = 447) 1 to 9 ( n  = 1,008) ≥10 ( n  = 645)
Age, mean (SD) 39.5 (9.8) 38.2 (10.9) 36.6 (9.1) 44.9 (7.5) <0.001
Per capita income (USD)a, mean (SD) 1,061.1 (709.2) 1,001.6 (680.5) 1,053.9 (689.2) 1,113.6 (755.3) 0.033
Weekly hours worked, mean (SD) 54.2 (19.1) 47.8 (17.5 54.4 (18.8) 57.8 (19.3) <0.001
Years at work in nursing, mean (SD) 15.2 (9.7) 15.18 (9.8) 15.2 (9.6) 15.6 (9.6) 0.697
BMI at 20 years, mean (SD) 21.1 (3.3) 21.1 (3.2) 21.2 (3.4) 21.1 (3.4) 0.604
BMI (current), mean (SD) 26.1 (5.1) 25.4 (4.8) 25.7 (4.9) 27.2 (5.4) <0.001
Number of biological children, mean (SD) 0.97 (1.0) 0.80 (0.94) 0.88 (0.99) 1.23 (1.03) <0.001
Marital status (% married) 58.9 56.8 59.8 58.9 0.563
Smoking status      
 Never smoker 76.6 77.7 80.8 69.2 <0.001
 Ex-smoker 15.0 15.0 11.7 20.3
 Current smoker 8.4 7.4 7.5 10.5
Alcohol consumption      
 Abstained 38.9 41.6 40.9 34.0 0.083
 Low 20.0 19.2 18.8 22.6
 Medium 32.2 32.1 32.8 34.4
 High 7.9 6.9 7.5 9.0
Physical activity (% yes) 30.2 32.4 30.0 29.0 0.464
Sleep time, mean (SD) 6.9 (1.5) 6.9 (1.5) 6.9 (1.5) 7.0 (1.6) 0.235
  1. aPrice on 12/30/2012 (BRL2.02).