Table 3 Stratified analysis of BCSS in the matched cohort

Age (years)

 18–49

No

Ref.

Ref.

Yes

0.49 (0.27–0.90)

0.45 (0.24–0.86)

 50–64

No

Ref.

Ref.

Yes

0.79 (0.51–1.22)

0.82 (0.53–1.27)

 65–79

No

Ref.

Ref.

Yes

0.80 (0.61–1.06)

0.78 (0.59–1.02)

 80–

No

Ref.

Ref.

Yes

0.67 (0.50–0.91)

0.64 (0.47–0.86)

T stage

 T1mic

No

Ref.

Ref.

Yes

1.01 (0.38–2.68)

0.94 (0.35–2.53)

 T1a

No

Ref.

Ref.

Yes

0.74 (0.42–1.30)

0.73 (0.42–1.30)

 T1b

No

Ref.

Ref.

Yes

0.74 (0.52–1.05)

0.72 (0.51–1.03)

 T1c

No

Ref.

Ref.

Yes

0.70 (0.56–0.88)

0.67 (0.54–0.84)

Grade

 I

No

Ref.

Ref.

Yes

0.98 (0.66–1.45)

0.98 (0.66–1.46)

 II

No

Ref.

Ref.

Yes

0.77 (0.59–1.01)

0.74 (0.57–0.97)

 III

No

Ref.

Ref.

Yes

0.51 (0.36–0.71)

0.49 (0.35–0.68)

 Unknown

No

Ref.

Ref.

Yes

0.98 (0.52–1.83)

0.92 (0.49–1.72)

Histological type

 Ductal

No

Ref.

Ref.

Yes

0.75 (0.62–0.92)

0.72 (0.59–0.88)

 Lobular

No

Ref.

Ref.

Yes

0.62 (0.38–0.97)

0.63 (0.39–0.99)

 Favorable

No

Ref.

Ref.

Yes

0.96 (0.50–1.84)

0.91 (0.47–1.75)

 Others

No

Ref.

Ref.

Yes

0.28 (0.06–1.38)

0.29 (0.06–1.41)