Table 2

Reproductive characteristics

VariablesCases
n (%)
Controls
n (%)
Total
n (%)
P value
Total495 (100)478 (100)973 (100)
Age at menarche (years)<0.001
 ≤1293 (18.79)137 (28.66)230 (23.64)
 13115 (23.23)121 (25.31)236 (24.25)
 14121 (24.44)119 (24.9)240 (24.67)
 1572 (14.55)55 (11.51)127 (13.05)
 ≥1694 (18.99)46 (9.62)140 (14.39)
Previously conceived<0.001
 Yes464 (93.74)371 (77.62)835 (85.82)
 No31 (6.26)107 (22.38)138 (14.18)
Abortion history0.012
 Yes243 (49.09)273 (57.11)516 (53.03)
 No252 (50.91)205 (42.89)457 (46.97)
Menopause<0.001
 Yes374 (75.56)127 (26.57)501 (51.49)
 No121 (24.44)351 (73.43)472 (48.51)
History of benign breast diseases0.201
 Yes98 (19.80)91 (19.04)189 (19.42)
 No360 (72.73)364 (76.15)724 (74.41)
 Unknown37 (7.47)23 (4.81)60 (6.17)
Family history of breast cancer0.025
 Yes44 (8.89)24 (5.02)68 (6.99)
 No441 (89.09)442 (92.47)883 (90.75)
 Unknown10 (2.02)12 (2.51)22 (2.26)