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Table 1 General characteristics of study population

From: Blood cadmium and volume of uterine fibroids in premenopausal women

Variables All subjects (N = 288) Women with uterine fibroids (N = 46) Women without uterine fibroids (N = 242) P
  Number (%) Number (%) Number (%)  
Age
 <40 years old 218 (75.7) 25 (54.4) 193 (79.8) <0.001
 ≥40 years old 70 (24.3) 21 (45.7) 49 (20.3)
Education
 ≤High school 92 (31.9) 18 (39.1) 74 (30.6) 0.333
 ≥University 196 (68.1) 28 (60.9) 168 (69.4)
Income/monthly
 <4,000,000 156 (54.4) 26 (56.5) 130 (53.9) 0.873
 ≥4,000,000 131 (45.6) 20 (43.5) 111 (46.1)
Marital status
 Married/living with partner 282 (98.3) 44 (95.7) 238 (98.8) 0.390
 Not married/divorced 5 (1.7) 2 (4.4) 3 (1.2)
Body mass index
 Non-obesity (<25 kg/m2) 245 (85.1) 38 (82.6) 207 (85.5) 0.776
 Obesity (≥25 kg/m2) 43 (14.9) 8 (17.4) 35 (14.5)
Hemoglobin
 Anemia (<12 g/dL) 263 (91.3) 39 (84.8) 224 (92.6) 0.152
 Non-anemia (≥12 g/dL) 25 (8.7) 7 (15.2) 18 (7.4)
Serum cotinine
 No exposure (<10 ng/ml) 268 (93.1) 41 (89.1) 227 (93.8) 0.409
 Passive/Active/Heavy smoking (≥10 ng/ml) 20 (6.9) 5 (10.9) 15 (6.2)
Gravidity
 No pregnancies 7 (2.4) 1 (2.2) 6 (2.5) 0.269
 1 pregnancy 58 (20.1) 9 (19.6) 49 (20.3)
 2 pregnancies 132 (45.8) 16 (34.8) 116 (47.9)
 3 or more pregnancies 91 (31.6) 20 (43.5) 71 (29.3)
Oral contraceptive pill use (ever)
 Yes 220 (76.4) 39 (84.8) 181 (74.8) 0.203
 No 68 (23.6) 7 (15.2) 61 (25.2)