Table 3 Oral contraceptive use in relation to triple-negative breast cancer ^a

Reference

(0.93 to 1.40)

(1.25 to 2.53)

(0.88 to 2.12)

(0.63 to 1.56)

(0.83 to 1.72)

(0.89 to 1.24)

(0.87 to 1.81)

(0.59 to 1.38)

(0.84 to 1.39)

(0.74 to 1.34)

(0.90 to 1.77)

(1.11 to 2.38)

Since last use

Duration

< 5 years

< 5 years

(0.72 to 2.40)

5 to 9 years

(1.58 to 4.61)

≥ 10 years

(1.06 to 2.60)

5 to 9 years

< 5 years

(0.35 to 2.30)

5 to 9 years

(0.47 to 2.48)

≥ 10 years

(1.04 to 3.07)

10 to 19 years

< 5 years

(0.70 to 1.79)

5 to 9 years

(0.53 to 1.45)

≥ 10 years

(0.87 to 2.11)

≥ 20 years

< 5 years

(0.83 to 1.49)

5 to 9 years

(0.42 to 1.06)

≥ 10 years

(0.65 to 2.00)