Skip to main content

Table 1 Characteristics of the study population.

From: Risk of infection and adverse outcomes among pregnant working women in selected occupational groups: A study in the Danish National Birth Cohort

  Work with patients1
(N = 8699)
Work with children2
(N = 9151)
Work with food3
(N = 932)
Work with
animals4
(N = 287)
Total exposed workers
(N = 19069)
Other workers
(N = 46308)
  N % N % N % N % N % N %
Maternal age, years             
   < 30 4166 48.7 4313 48.0 569 62.3 168 59.2 9216 49.2 19724 43.3
   30-34 3089 36.1 3340 37.2 246 26.9 84 29.6 6759 36.1 18425 40.5
   35+ 1294 15.1 1335 14.9 99 10.8 32 11.3 2760 14.7 7358 16.2
   Total 8549 100.0 8988 100.0 914 100.0 284 100.0 18735 100.0 45507 100.0
Parity             
   0 3354 38.6 3465 37.9 332 35.7 98 34.1 7249 38.0 17701 38.2
   1+ 5342 61.4 5684 62.1 599 64.3 189 65.9 11814 62.0 28584 61.8
   Total 8696 100.0 9149 100.0 931 100.0 287 100.0 19063 100.0 46285 100.0
Pre-pregnancy body mass index, kg/m2             
   Underweight (< 18.5) 75 0.9 61 0.7 9 1.1 9 0.1 145 0.8 530 1.3
   Normal weight (18.5-24.9) 5183 64.7 4802 58.6 376 44.8 125 48.8 10486 60.6 26081 62.1
   Overweight (25.0-29.9) 1949 24.3 2272 27.7 279 33.2 78 30.5 4578 26.5 10997 26.2
   Obese/very obese (30.0+) 800 10.0 1064 13.0 176 21.0 53 20.7 2093 12.1 4381 10.4
   Total 8007 100.0 8199 100.0 840 100.0 256 100.0 17302 100.0 41989 100.0
Smoking habit             
   No 6608 76.0 6779 76.0 619 66.5 182 63.4 14188 74.4 34709 75.0
   Yes 2086 24.0 2086 24.0 312 33.5 105 36.6 4872 25.6 11586 25.0
   Total 8694 100.0 8694 100.0 931 100.0 287 100.0 19060 100.0 46295 100.0
Smoking habit, cig./day¥             
   0 6627 76.2 6807 74.4 623 66.9 183 63.8 14240 74.7 34806 75.2
   1-9 1193 13.7 1364 14.9 162 17.4 40 13.9 2759 14.5 6483 14.0
   10-19 758 8.7 850 9.3 123 13.2 55 19.2 1786 9.4 4241 9.2
   20+ 116 1.3 127 1.4 23 2.5 9 3.1 275 1.4 766 1.7
   Total 8694 100.0 9148 100.0 931 100.0 287 100.0 19060 100.0 46296 100.0
Alcohol consumption, gr./week             
   0 6278 72.2 6788 74.2 748 80.3 232 80.8 14046 73.7 32222 69.6
   0.1-19.9 149 1.7 157 1.7 5 0.5 3 1.0 314 1.6 744 1.6
   20-39.9 1470 16.9 1412 15.4 124 13.3 32 11.1 3038 15.9 8473 18.3
   40+ 802 9.2 794 8.7 55 5.9 20 7.0 1671 8.8 4869 10.5
   Total 8699 100.0 9151 100.0 932 100.0 287 100.0 19069 100.0 46308 100.0
History of miscarriage             
   No 7142 82.2 7592 83.0 775 83.2 246 85.7 15755 82.7 38282 82.7
   Yes 1550 17.8 1555 17.0 156 16.8 41 14.3 3302 17.3 7984 17.3
   Total 8692 100.0 9147 100.0 931 100.0 287 100.0 19057 100.0 46266 100.0
Infertility treatment             
   No 8045 92.5 8565 93.6 876 94.0 277 96.5 17763 93.2 42780 92.4
   Yes 649 7.5 586 6.4 56 6.0 10 3.5 1301 6.8 3505 7.6
   Total 8694 100.0 9151 100.0 932 100.0 287 100.0 19064 100.0 46285 100.0
Work at the time of the 1st interview*             
   No 298 3.4 428 4.7 82 8.8 32 11.1 840 4.4 171 0.4
   Yes 8400 96.6 8722 95.3 849 91.2 255 88.9 18226 95.6 41039 99.6
   Total 8698 100.0 9150 100.0 931 100.0 287 100.0 19066 100.0 41210 100.0
Socio-occupational status             
   High 6484 74.5 7386 80.7 213 22.9 49 17.1 14132 74.1 30294 65.5
   Medium 2210 25.4 1762 19.3 719 77.1 168 58.5 4859 25.5 14564 31.5
   Low 4 0.1 2 0.1 0 0 70 24.4 76 0.4 1421 3.1
   Total 8698 100.0 9150 100.0 932 100.0 287 100.0 19067 100.0 46279 100.0
  1. 1Health care and laboratory workers in hospitals
  2. 2Day care centres workers and school teacher
  3. 3Kitchen assistant, waitress and butcher
  4. 4Skiled farm worker, slaughter house worker
  5. ¥1 cigarette = 1 cigarette equivalent, 1 cherrot = 2 cigarette equivalent, 1 cigar = 2 cigarette equivalent, 1 pipe = 1.5 cigarette equivalent.
  6. Among singletons
  7. *First tree month of the pregnant