Table 3.
Estimated risks of some work characteristics with sPTB in the EMIP study.
| Characteristics of paid work | sPTB | Term birth | OR | 95% CI |
|---|---|---|---|---|
| N (%) | N (%) | |||
| Period of pregnancy when women worked (a) | ||||
| Never worked | 825 (64.8) | 644 (56.7) | Ref. | |
| Without paid work during pregnancy or worked until 7th month | 298 (23.4) | 165 (14.5) | 1.41 | [1.16–1.72] |
| Worked until 8–9th month | 150 (11.8) | 326 (28.7) | 0.36 | [0.27–0.48] |
| Intense physical effort (b) | ||||
| Without work/No intense work | 1,043 (86.1) | 899 (82.2) | Ref. | |
| Yes/Sometimes | 169 (13.9) | 195 (17.8) | 0.75 | [0.55–1.02] |
| Standing required (c) | ||||
| Without work/No or Sometimes | 1,004 (82.8) | 849 (77.7) | Ref. | |
| Yes | 208 (17.2) | 244 (22.3) | 0.72 | [0.59–0.88] |
| Working hours (d) | ||||
| Without work/Up to 8 hours/day | 1,097 (90.7) | 965 (88.4) | Ref. | |
| More than 8 hours/day | 112 (9.3) | 127 (11.6) | 0.78 | [0.53–1.13] |
| Working the night shift (e) | ||||
| Without work/No/Sometimes | 1,150 (95.3) | 1,014 (92.9) | Ref.. | |
| Yes | 57 (4.7) | 77 (7.1) | 0.65 | [0.42–1.01] |
| Household work (f) | ||||
| Not or Yes, aided | 660 (51.6) | 514 (45.3) | Ref. | |
| Yes, unaided | 620 (48.4) | 621 (54.7) | 0.78 | [0.64–0.94] |
| Level of work (g) | ||||
| No work or not intense | 1,024 (85.3) | 888 (81.8) | Ref. | |
| Intense | 176 (14.7) | 198 (18.2) | 0.77 | [0.59–1.00] |
Missing information for a) 8; b) 110; c) 111; d) 115; e) 118; f) 1; g) 130.
Level of work defined as having two or more of the following: work with intense physical effort; standing; more than 8 h/day; at night.