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Table 1 Selected characteristics for 1,011 breast cancer cases and 1,011 controls matched by year of birth and menopausal status

From: Association of paternal age at birth and the risk of breast cancer in offspring: a case control study

Risk factor Cases (%) Control (%) OR (95% CI)
  n = 1,011 n = 1,011  
Age (yrs) (mean ± SD) 47.7 ± 10.9 47.7 ± 11.7 p = 0.984*
Education    
Under or at middle school 315 (31.3) 319 (31.7) 1.0
At high school 378 (37.5) 407 (40.5) 1.0 (0.80–1.24)
At or over college 315 (31.3) 280 (27.8) 1.2 (0.98–1.57)
FHBC    
No 937 (92.7) 976 (96.5) 1.0
Yes 74 (7.3) 35 (3.5) 2.2 (1.47–3.38)
Age at FFTP (yrs) or nulliparity    
<25 325 (32.2) 349 (34.9) 1.0
25–29 477 (47.3) 471 (47.1) 1.1 (0.92–1.38)
≥30 or nulliparity 206 (20.4) 181 (18.1) 1.3 (1.04–1.76)
P for trend    p = 0.027
LEE (yrs) (mean ± SD) 29.1 ± 6.9 28.3 ± 7.4 1.2 (1.05–1.41)
BMI (kg/m 2 )    
<25.0 748 (74.4) 769 (76.8) 1.0
25.0–29.9 227 (22.6) 216 (21.6) 1.0 (0.84–1.29)
≥30.0 31 (3.1) 16 (1.6) 2.0 (1.07–3.78)
Smoking status    
Nonsmoker 933 (92.4) 943 (93.4) 1.0
Smoker 77 (7.6) 67 (6.6) 1.2 (0.85–1.70)
Alcohol drinking    
<1/month 756 (74.8) 709 (72.3) 1.0
1–3/month 178 (17.6) 211 (21.5) 0.8 (0.64–1.02)
≥1/week 77 (7.6) 61 (6.2) 1.2 (0.86–1.76)
  1. OR of case vs. matched control adjusted for family history of breast cancer in 1st or 2nd degree relatives and lifetime estrogen exposure duration
  2. *P value by student t test, OR per 10 year, FHBC, Family history of breast cancer in 1st or 2nd degree relatives; FFTP, first full-term pregnancy; LEE, lifetime estrogen exposure duration