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Table 1 Incidence of breast cancer by characteristics of the participants of the SBSP

From: Performance of breast cancer screening methods and modality among Chinese women: a report from a society-based breast screening program (SBSP) in Shanghai

Characteristics

No. of subjects

No. of cases

Person years

Incidence (/100,000 PYs)

HR (95% CI)

All subjects

14464

66

34001

194

Age (yrs.)

    < 40

1020

0

2122

0

    40-

2833

9

6848

131

0.60 (0.28, 1.27)

    50-

5349

29

13200

220

1.00 (ref.)

    60-

4213

23

9712

237

1.07 (0.62, 1.85)

    70-

1049

5

2118

236

1.05 (0.40, 2.72)

Education

    Primary school or No formal education

3324

17

8940

190

1.23 (0.62, 2.44)

    Junior middle school

5646

18

13361

135

1.00 (ref.)

    Senior high school or technical school

3739

21

8099

259

1.86 (0.99, 3.49)

    Junior college

1018

6

2148

279

2.44 (0.96, 6.19)

    Regular college or above

737

4

1454

275

2.91 (0.97, 8.72)

Family history of breast cancer

    Yes

366

5

858

583

3.03 (1.22, 7.54)

    No

14098

61

33143

184

1.00 (ref.)

Age at menarche (yrs.)

    ≤ 13

2078

15

4582

327

1.99 (1.10, 3.58)

    14-17

10330

44

24273

181

1.00 (ref.)

    > 17

2053

7

5142

136

0.66 (0.29, 1.47)

Menopausal status

    Pre-menopause

4455

12

10510

114

0.81 (0.32, 2.04)

    Post-menopause

9996

54

23462

230

1.00 (ref.)

Age at menopause (yrs.)

    < 45

721

4

1704

235

1.12 (0.41, 3.11)

    45-54

8323

44

19523

225

1.00 (ref.)

    ≥ 55

952

6

2234

269

1.20 (0.51, 2.81)

Age at first live birth (yrs.)

    Nulliparity

299

0

643

0

    < 24

3290

13

7940

164

0.99 (0.51, 1.92)

    24-29

9121

39

21691

180

1.00 (ref.)

    ≥ 30

1750

14

3718

377

2.01 (1.09, 3.71)

  1. Missing values were excluded from the analysis (3 subjects for age at menarche, 13 for menopause status and 4 for age at first live birth).