Table I.
Comparison of demographic factors between case and control groups
| Variable | Levels | Control group (n = 153) | Stage I/II endometriosis (n = 122) | Stage III/IV endometriosis (n = 128) | Value of p | Crude OR* (95% CI) Any stage | Crude OR** (95% CI) Stage III/IV |
|---|---|---|---|---|---|---|---|
| Age [years] | 30.18 ±4.37 | 30.85 ±4.53 | 31.37 ±4.79 | 0.093 | 1.047 (1.001, 1.095) | 1.059 (1.005-1.115) | |
| Type of infertility | Primary | 145 (39.0%) | 113 (30.4%) | 114 (30.6%) | 0.176 | 1† | 1† |
| Secondary | 8 (26.7%) | 8 (26.7%) | 14 (46.7%) | 1.757 (0.762-4.051) | 2.226 (0.903-5.489) | ||
| Duration of infertility [years] | 8.24 ±4.68a | 7.05 ±4.64ab | 5.96 ±4.65b | < 0.001 | 0.926 (0.886-0.967) | 0.897 (0.848-0.948) | |
| Education status [years] | < 12 | 50 (53.8%) | 27 (29.0%) | 16 (17.2%) | < 0.001 | 1† | 1† |
| 12 | 59 (39.6%) | 42 (28.2%) | 48 (32.2%) | 1.774 (1.051-2.994) | 2.542 (1.288-5.017) | ||
| > 12 | 44 (27.3%) | 53 (32.9%) | 64 (39.8%) | 3.092 (1.811-5.28) | 4.545 (2.300-8.984) | ||
| Occupational status | Housekeeper | 111 (40.7%) | 87 (31.9%) | 75 (27.5%) | 0.027 | 1† | 1† |
| Employee | 42 (32.3%) | 35 (26.9%) | 53 (40.8%) | 1.436 (0.925-2.229) | 1.868 (1.133-3.078) | ||
| BMI [kg/m2] | 26.21 ±4.20a | 24.70 ±3.87b | 23.58 ±3.62b | < 0.001 | 0.877 (0.831-0.925) | 0.830 (0.771-0.893) | |
| Smoking | Yes | 149 (37.5%) | 121 (30.5%) | 127 (32.0%) | 0.388 | 1† | 1† |
| No | 4 (66.7%) | 1 (16.7%) | 1 (16.7%) | 0.300 (0.054-1.66) | 0.293 (0.032-2.658) | ||
| Exercise | No | 108 (36.7%) | 92 (31.3%) | 94 (32.0%) | 0.663 | 1† | 1† |
| Yes | 45 (41.3%) | 30 (27.5%) | 34 (31.2%) | 0.826 (0.527-1.294) | 0.868 (0.514-1.466) | ||
| Family history of endometriosis | No | 152 (39.3%) | 121 (31.3%) | 114 (29.4%) | < 0.001 | 1† | 1† |
| Yes | 1 (6.25%) | 1 (6.25%) | 14 (87.5%) | 9.702 (1.269-74.206) | 18.667 (2.419-144.024) |
*
Odds ratio for comparing any type of endometriosis with control group
**
Odds ratio for comparing severe endometriosis patients with control group
a,b
The same letters indicate no statistical significance based on the Tukey HSD multiple comparison procedure
†
Reference category