Working conditions from pregnant workers at 16 and 24 weeks of pregnancy*
| 16 weeks of pregnancy | 24 weeks of pregnancy | |||||||||
| Intervention group n=119 | Control group n=122 | RR | 95% CI | P value | Intervention group n=97 | Control group n=108 | RR | 95% CI | P value | |
| Working times | ||||||||||
| Hours/week† | 34.4 (7.4) (6–50) | 33.4 (9.1) (8–50) | 0.382 | 33.6 (8.6) (4–48) | 32.1 (9.5) (6–60) | 0.590 | ||||
| Days/week† | 4.3 (0.8) (2–6) | 4.1 (1) (1–7) | 0.184 | 4.4 (0.1) (0–6) | 4.2 (0.8) (0–6) | 0.400 | ||||
| Irregular working times | 17 (14%) | 18 (15%) | 0.897 | 12 (12%) | 17 (16%) | 0.489 | ||||
| Evening shifts‡ | 17 (12.4) (10.6) | 17 (6.7) (12.3) | 0.902 | 11 (22.3) (3.2) | 14 (19.9) (2.2) | 0.723 | ||||
| Night shifts‡ | 18 (9) (7.5) | 18 (3) (6.3) | 0.957 | 2 (2.2) (1.9) | 4 (2.7) (1.5) | 0.686 | ||||
| Physical work | ||||||||||
| Standing/walking ≥4 hours/day | 37 (32%) | 41 (35%) | 0.678 | 32 (32%) | 33 (34%) | 0.833 | ||||
| Lifting/carrying loads or people | 33 (28%) | 31 (25%) | 0.712 | 18 (19%) | 20 (19%) | 0.994 | ||||
| Physical work: regularly/often | ||||||||||
| Bending | 28 (24%) | 25 (21%) | 0.592 | 19 (20%) | 26 (24%) | 0.438 | ||||
| Physically very demanding | 24 (19%) | 17 (14%) | 0.351 | 15 (16%) | 17 (16%) | 0.957 | ||||
| Requiring physical strength | 19 (16%) | 14 (12%) | 0.323 | 14 (14%) | 10 (9%) | 0.250 | ||||
| Job strain: often/always | ||||||||||
| Problems with pressure | 17 (14%) | 32 (26%) | 0.55 | 0.32 to 0.91 | 0.021 | 11 (11%) | 17 (16%) | 0.360 | ||
| Like to take things a little easier | 23 (19%) | 38 (31%) | 0.62 | 0.40 to 0.98 | 0.035 | 23 (24%) | 28 (26%) | 0.714 | ||
| Freedom in performance of tasks | 83 (70%) | 93 (76%) | 0.257 | 61 (63%) | 85 (79%) | 0.57 | 0.37 to 0.90 | 0.013 | ||
| Influence on the pace to work | 57 (48%) | 67 (55%) | 0.303 | 50 (52%) | 60 (58%) | 0.359 | ||||
| Planning own work | 75 (63%) | 77 (63%) | 0.975 | 59 (61%) | 70 (65%) | 0.555 | ||||
| Support from manager | 66 (56%) | 80 (66%) | 0.091 | 55 (57%) | 67 (62%) | 0.437 | ||||
| Enjoy working | 93 (78%) | 111 (91%) | 0.86 | 0.77 to 0.96 | 0.006 | 76 (79%) | 100 (93%) | 0.34 | 0.16 to 0.74 | 0.003 |
| Finds work satisfying | 93 (78%) | 113 (93%) | 0.84 | 0.76 to 0.94 | 0.001 | 73 (75%) | 98 (91%) | 0.37 | 0.19 to 0.74 | 0.003 |
| Exposed to biological agents | 36 (30%) | 33 (27%) | 0.610 | 24 (35%) | 29 (27%) | 0.200 | ||||
| Exposed to chemical agents | 9 (8%) | 7 (6%) | 0.581 | 9 (9%) | 7 (7%) | 0.456 | ||||
| Noise | 40 (34%) | 32 (26%) | 0.226 | 32 (33%) | 31 (29%) | 0.507 | ||||
*Complete results in online supplemental file C.
†Mean (SD) (min-max).
‡n, mean hours/week (SD), all other variables mentioned as n (%).
RR, relative risk.