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Table 1 Distribution of basic characteristics and selected breast cancer risk factors among Hong Kong Chinese women, 2012–15

From: Nighttime eating and breast cancer among Chinese women in Hong Kong

Variables Case participants
(n = 922)
Controls
(n = 913)
Age at interview (years) 56.0 ± 11.8 53.7 ± 11.7
Age at menarche (years) 13.6 ± 2.0 13.8 ± 2.3
Age at first birth (years) 26.4 ± 4.9 25.6 ± 4.7
BMI (kg/m2) 23.5 ± 3.7 23.0 ± 3.9
BMIa
 Underweight (<18.5) 44 (4.8) 74 (8.1)
 Normal (18.5–22.9) 329 (35.7) 350 (38.3)
 Overweight (23.0–24.9) 160 (17.4) 157 (17.2)
 Obesity I (25–29.9) 205 (22.2) 162 (17.7)
 Obesity II (≥30) 45 (4.9) 40 (4.4)
 Unknown 139 (15.1) 130 (14.2)
First-degree family cancer history
 Yes 323 (35.0) 246 (26.9)
 No 572 (62.0) 652 (71.4)
 Unknown 27 (2.9) 15 (1.6)
Family history of breast cancer
 Yes 70 (7.6) 28 (3.1)
 No 825 (89.5) 870 (95.3)
 Unknown 27 (2.9) 15 (1.6)
Parity, number of births
 0 164 (17.8) 154 (16.8)
 1–2 484 (52.5) 473 (51.8)
 ≥3 228 (24.7) 269 (29.5)
 Unknown 46 (5.0) 17 (1.9)
Smoking
 Ever 63 (6.8) 69 (7.6)
 Never 859 (93.2) 844 (92.4)
Alcohol drinking
 Yes 47 (5.1) 41 (4.5)
 No 875 (94.9) 872 (95.5)
Shift work
 Yes 111 (12.0) 150 (16.4)
 No 771 (83.6) 737 (80.7)
 Unknown 40 (4.3) 26 (2.8)
Histological type
 Ductal 809 (87.7)  
 Lobular 30 (3.3)  
 Mucinous 36 (3.9)  
 Medullary 3 (0.3)  
 Others 44 (4.8)  
Tumor stage
 Stage I 240 (31.8)  
 Stage II 298 (39.4)  
 Stage III 96 (12.7)  
 Stage IV 42 (5.6)  
 Un-staged 79 (10.5)  
Estrogen receptor status
 Positive 601 (76.7)  
 Negative 183 (23.3)  
Progesterone receptor status
 Positive 450 (59.5)  
 Negative 306 (40.5)  
C-erbB2/HER2
 Negative(IHC score 0/1) 351 (45.8)  
 Weakly positive (IHC score 2) 268 (35.0)  
 Positive (IHC score 3) 147 (19.2)  
  1. Values expressed as mean ± SD or number (percent). Subjects with missing values were excluded from the analyses. aCutoff points for body mass index (BMI) recommended by the World Health Organization to classify overweight and obese individuals in Asian populations. HER2 human epidermal growth factor receptor 2, IHC immunohistochemical analysis