Table 2

Characteristics of 19 837 nurses at recruitment (1993/1999) according to the different working shifts

Day shift
N=12 414
Evening shift
N=2022
Night shift
N=1098
Rotating shift
N=4330
Person-years, years193 62431 61917 11865 716
Cases, n50910484176
Baseline age, mean (SD)51.3 (5.2)53.0 (5.9)54.3 (5.9)50.2 (4.9)
BMI
 Underweight (<18.5 kg/m2), n (%)226 (1.8)60 (2.9)35 (3.1)80 (1.8)
 Normal (18.5–25 kg/m2), n (%)8825 (71.0)1475 (72.9)710 (64.6)3114(71.7)
 Overweight (25–30 kg/m2), n (%)2723 (21.9)384 (18.9)271 (24.6)942 (21.7)
 Obese (>30 kg/m2), n (%)640 (5.1)103 (5.0)82 (7.4)203 (4.6)
Smoking status
 Never smoked, n (%)4537 (36.5)723 (35.7)324 (29.5)1601 (36.9)
 Currently smoker, n (%)4113 (33.1)758 (37.4)512 (46.6)1471 (33.9)
 Previously smoked, n (%)3764 (30.3)541 (26.7)262 (23.8)1267 (29.2)
Smoking intensity* (g/day), mean (SD)7.6 (9.1)8.1 (9.1)9.9 (9.6)7.4 (8.3)
Alcohol consumption (g/week), mean (SD)125.7 (125.4)98.4 (111.8)102.1 (133.0)116.1 (129.4)
Physical activity, mean2.32.22.32.2
 Low, n (%)716 (5.7)84 (4.1)67 (6.1)190 (4.3)
 Medium, n (%)8204 (66.0)1362 (67.3)681 (62.0)2858 (65.8)
 High, n (%)3494 (28.1)576 (28.4)350 (31.9)1291 (29.7)
Consume vegetables and fruit, n (%)12 414 (98.1)1960 (96.9)1060 (96.5)4247 (97.8)
Consume fatty meat, n (%)1033 (8.3)214 (10.5)146 (13.3)383 (8.83)
Avoid fatty meat, n (%)11 381 (91.6)1808 (89.4)952 (86.7)3956 (91.1)
Hypertension, n (%)1253 (10.0)213 (10.5)120 (10.9)384 (8.8)
AMI, n (%)34 (0.2)10 (0.4)6 (0.5)10 (0.2)
Employment status
 Employed, n (%)12 325 (99.2)1994 (98.6)1092 (99.4)4313 (99.4)
 Retired, n (%)60 (0.4)21 (1.0)4 (0.3)14 (0.3)
 Unemployed, n (%)4 (0.03)0 (0.0)0 (0.0)2 (0.05)
 During rehabilitation, n (%)25 (0.2)7 (0.3)2 (0.1)9 (0.2)
Marital status
 Married, n (%)9465 (76.2)1494 (73.8)7474 (68.0)3121 (71.9)
 Separated, n (%)204 (1.6)36 (1.7)21 (1.9)98 (2.2)
 Divorced, n (%)1344 (10.8)236 (11.6)172 (15.6)567 (13.0)
 Unmarried, n (%)910 (7.3)152 (7.5)87 (7.9)404 (9.3)
 Widow, n (%)491 (3.9)104 (5.1)71 (6.4)149 (3.4)
  • *In ever smokers.

  • AMI, acute myocardial infarction; BMI, body mass index.