Table 5.
Associations between ergonomic factors and endometriosis. [95% CI=95% confidence interval; N=number of flight attendants (including all endometriosis cases); ORadj=adjusted odds ratio].
| N | ORcrude | 95% CI | P-value | ORadja | 95% CI | P-value | |
|---|---|---|---|---|---|---|---|
| Lifting ≥15 lbs (times/day) |
0.11 b | 0.09 b | |||||
| 0–5 | 357 | 1.0 | Ref | 1.0 | Ref | ||
| 6–10 | 560 | 1.5 | 0.9–2.6 | 1.5 | 0.8–2.5 | ||
| >10 | 693 | 0.7 | 0.4–1.3 | 0.7 | 0.4–1.3 | ||
| Standing (hours/day) |
· b | · b | |||||
| 0–8 | 555 | 1.0 | Ref | 1.0 | Ref | ||
| >8 | 1055 | 1.4 | 0.9–2.2 | 1.4 | 0.9–2.2 | ||
| Bending (times/day) |
0.42 b | 0.46 b | |||||
| 0–50 | 567 | 1.0 | Ref | 1.0 | Ref | ||
| 51–75 | 365 | 1.0 | 0.6–1.7 | 1.0 | 0.6–1.7 | ||
| >75 | 678 | 0.8 | 0.5–1.3 | 0.8 | 0.5–1.4 | ||
| Pushing and pulling (times/ day) |
0.17 b | 0.17 b | |||||
| 0–19 | 490 | 1.0 | Ref | 1.0 | Ref | ||
| 20–30 | 327 | 0.9 | 0.5–1.6 | 0.9 | 0.5–1.6 | ||
| >30 | 793 | 0.7 | 0.4–1.2 | 0.7 | 0.4–1.2 | ||
| Overall physical effort |
0.42 c | 0.51 c | |||||
| Light, moderate |
575 | 1.0 | Ref | 1.0 | Ref | ||
| Somewhat hard |
832 | 1.0 | 0.6–1.6 | 0.9 | 0.6–1.5 | ||
| Very hard | 203 | 1.4 | 0.8–2.7 | 1.4 | 0.7–2.6 | ||
a
Adjusted for body mass index (continuous variable) and study site.
b
Midpoint of category used to calculate P for linear trend when upper boundary for the category was defined; 1.5 times the lower bound used when there was no upper boundary. P for trend are only presented for variables with ≥3 categories.
c
Ordinal value corresponding to categories used to calculate P-value for linear trend