Table 1 Baseline characteristics for a cohort of women diagnosed with breast cancer between 2000 and 2011 and a cohort of women without breast cancer (five individuals for each patient with breast cancer, matched for age). All individuals were alive when breast cancer was diagnosed

Sociodemographic factors

Age at diagnosis (years):

30-39

8.5 (1,119)

8.5 (5,170)

40-49

33.3 (4,362)

33.2 (20,180)

50-59

58.2 (7,620)

58.3 (35,469)

Highest completed education:

Low levels (ISCED 0-3)

61.4 (8,047)

63.9 (38,845)

Intermediate levels (ISCED 5-6)

30.6 (4,005)

29.2 (17,767)

High levels (ISCED 7-8)

8.0 (1.054)

6.9 (4,207)

Income (DKK, deflated to 2009):

First tertile (<267,246)

(<53,450$)

30.7 (4,026)

33.5 (20,368)

Second tertile (267,247-348,964)

(53,450-69,790$)

32.7 (4,286)

33.1 (20,108)

Third tertile (>348,965)

(>69,790$)

36.6 (4,789)

33.5 (20,343)

Marital status:

Married/cohabiting

58.6 (7,670)

64.6 (39,278)

Single

41.4 (5,431)

35.4 (21,541)

Prior use of psychiatric medical treatment:

Yes

15.5 (2,028)

14.2 (8,630)

No

84.5 (11,073)

85.8 (52,189)

Clinical factors

Year of diagnosis:

2000

7.9 (1,038)

7.9 (4,826)

2001

8.2 (1,080)

8.0 (4,870)

2002

8.7 (1,137)

8.5 (5,137)

2003

8.3 (1,091)

7.9 (4,798)

2004

8.0 (1,053)

8.1 (4,898)

2005

7.5 (985)

7.6 (4,609)

2006

7.1 (934)

7.5 (4,565)

2007

7.9 (1,037)

7.8 (4,718)

2008

8.8 (1,133)

8.8 (5,337)

2009

10.6 (1,384)

10.6 (6,477)

2010

9.3 (1,215)

9.4 (5,700)

2011

7.7 (1,014)

8.0 (4,884)

Type of surgery:

Lumpectomy

58.6 (7,684)

-

Mastectomy

41.3 (5,407)

-

Biopsy

0.1 (10)

-

Adjuvant treatment:

No adjuvant treatment

16.0 (2,108)

-

Chemotherapy

18.9 (2,474)

-

Endocrine

13.5 (1,774)

-

Chemotherapy AND endocrine

46.2 (6,049)

-

Not in protocol

5.3 (696)

-

Tumour size (mm):

1-20

63.2 (8,281)

-

21-50

33.7 (4,419)

-

>50

3.1 (401)

-

Involved lymph nodes:

0

49.7 (6,505)

-

1-3

34.1 (4,469)

-

≥4

16.2 (2,127)

-