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Table 1 Demographic characteristics and known breast cancer risk factors of study participantsa

From: Germline APOBEC3B deletion is associated with breast cancer risk in an Asian multi-ethnic cohort and with immune cell presentation

Category Cases (N = 1451) Controls (N = 1442) P value
Demographic factors
 Age (year) 51.6 ± 7.5 51.4 ± 7.3 0.49b
Reproductive risk factors
 Age at menarche (year) 13.0 ± 1.5 12.9 ± 1.4 0.05b
 Age at menopause (year)d 49.4 ± 4.5 49.3 ± 4.4 0.54b
 Number of live birthse 2.9 ± 1.3 3.2 ± 1.5 <0.01b
 Age at first live birth (year)e 26.4 ± 5.0 27.5 ± 4.9 <0.01b
Other risk factors
 First-degree relatives with breast cancer (%) 13.2 11.0 0.08c
 First- or second-degree relatives with breast cancer (%) 19.6 17.8 0.23c
 Oral contraceptive (%)f 28.2 31.5 0.06c
 Hormone replacement therapy (%)f 9.5 9.8 0.80c
  1. aUnless otherwise specified, data are presented in mean ± standard deviation
  2. b t test
  3. cChi-squared test
  4. dAmong postmenopausal women
  5. eAmong parous women
  6. fEver user