Population-based¹

Hospital-based¹

P²

Type of surgery (N (%))

≤2 cm

Breast conserving therapy

4758 (73)

2649 (80)

<0.001

Modified radical mastectomy

1836 (27)

643 (20)

>2 cm

Breast conserving therapy

1803 (35)

1240 (41)

<0.001

Modified radical mastectomy

3324 (65)

1793 (59)

Adjuvant chemotherapy (N (%))

Node negative

Yes

277 (4)

132 (4)

0.967

No

6347 (96)

3011 (96)

Node positive

Yes

1773 (33)

1477 (43)

<0.001

No

3575 (67)

1958 (57)