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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).