Skip to main content

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