Table 1.
Characteristics of cases and controls
| Cases (N = 161) | Controls (N = 303) | p valuea | |
|---|---|---|---|
| Age at blood donation | |||
| ≤45 years | 71 (44.1) | 143 (47.2) | |
| 45–50 years | 62 (38.5) | 103 (34.0) | |
| ≥50 years | 28 (17.4) | 57 (18.8) | Matched |
| Age at diagnosis | |||
| <55 years | 51 (31.7) | ||
| ≥55 years | 110 (68.3) | ||
| Lagtime | |||
| ≤10 years | 54 (33.5) | ||
| >10 years | 107 (66.5) | ||
| Age at menarche | |||
| ≤12 years | 85 (52.8) | 127 (42.1) | |
| 12–14 years | 43 (26.7) | 95 (31.5) | |
| ≥14 years | 33 (20.5) | 80 (26.5) | 0.02 |
| Missing | 1 | ||
| Height | |||
| ≤160 cm | 70 (44.3) | 145 (48.0) | |
| >160 cm | 88 (55.7) | 157 (52.0) | 0.57 |
| Missing | 3 | 1 | |
| Weight | |||
| ≤65 kg | 76 (49.4) | 186 (64.6) | |
| >65 kg | 78 (50.6) | 102 (35.4) | 0.003 |
| Missing | 7 | 15 | |
| BMI | |||
| <25 kg/m2 | 82 (53.6) | 199 (69.1) | |
| 25–30 kg/m2 | 38 (24.8) | 69 (24.0) | |
| ≥30 kg/m2 | 33 (21.6) | 20 (6.9) | <0.0001 |
| Missing | 8 | 15 | |
| Number of full term pregnancies | |||
| 0 | 53 (34.6) | 76 (26.3) | |
| 1–2 | 81 (52.9) | 152 (52.6) | |
| 3+ | 19 (12.4) | 61 (21.1) | 0.01 |
| Missing | 8 | 14 | |
| Oral contraceptive use | |||
| Never | 78 (52.7) | 120 (42.3) | |
| Ever | 70 (47.3) | 164 (57.7) | 0.03 |
| Missing | 13 | 19 | |
| HRT useb | |||
| Never | 83 (63.8) | 149 (62.1) | |
| Ever | 47 (36.2) | 91 (37.9) | |
| Missing | 31 | 63 | 0.77 |
a p values from conditional logistic regression models for ordered categorical variables
bUse of estrogen alone and estrogen together with progesterone formulations prior to index date