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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%)