Table 2 Comparison of clinical characteristics after matching data between the two groups
From: Relationship between formulaic breast volume and risk of breast cancer based on linear measurements
Covariates | Control group | Case group | Test statistics | P value |
|---|---|---|---|---|
Age | 49.9 (45.0, 54.0) | 50.5 (44.0, 57.0) | U = 16,454.00 | 0.522 |
BMI | 23.83 (21.24, 25.42) | 23.65 (21.16, 26.04) | U = 17,032.00 | 0.938 |
Menarche age | 14.4 (13.0, 15.0) | 14.4 (13.0, 15.0) | U = 16,409.00 | 0.484 |
Age at first pregnancy | 24.3 (21.0, 26.0) | 24.1 (22.0, 26.0) | U = 17,101.50 | 0.991 |
Number of pregnancies | 3.1 (2.0, 4.0) | 3.1 (2.0, 4.0) | U = 17,090.50 | 0.983 |
Feeding mode | – | 1 | ||
Breastfeeding | 175 (94.6%) | 175 (94.6%) | ||
Non-breastfeeding | 10 (5.4%) | 10 (5.4%) | ||
Proliferative benign breast disease | χ2 = 0.106 | 0.745 | ||
Yes | 68 (36.8%) | 65 (35.1%) | ||
No | 117 (63.2%) | 120 (64.9%) | ||
Oral contraceptives | χ2 = 0.492 | 0.483 | ||
Yes | 20 (10.8%) | 16 (8.6%) | ||
No | 165 (89.2%) | 169 (91.4%) | ||
Smoking | – | 1 | ||
Yes | 0 (0) | 0 (0) | ||
No | 185 (100.0%) | 185 (100.0%) | ||
Alcohol consumption | χ2 = 1.387 | 0.239 | ||
No risk | 178 (96.2%) | 173 (93.5%) | ||
Low risk | 7 (3.8%) | 12 (6.5%) | ||
High risk | 0 | 0 | ||
History of hyperthyroidism | 1 (0.5%) | 4 (2.2%) | χ2 = 1.825 | 0.177 |
Yes | 184 (99.5%) | 181 (97.8%) | ||
No | ||||
Family history | χ2 = 1.378 | 0.240 | ||
Yes | 4 (2.2%) | 8 (4.3%) | ||
No | 181 (97.8%) | 177 (95.7%) |