Table 1 Patient characteristics according to annual hospital volume of patients with metastatic colorectal cancer

Sex

Male

1,325 (57%)

1,455 (56%)

1,386 (55%)

1,400 (56%)

5,566 (56%)

0.466

Female

1,003 (43%)

1,136 (44%)

1,145 (45%)

1,118 (44%)

4,402 (44%)

Age

Median (years)

71

70

71

69

70

18–64 years

631 (27%)

784 (30%)

757 (30%)

889 (35%)

3,061 (31%)

 < 0.001

65–79 years

1,182 (51%)

1,265 (49%)

1,221 (48%)

1,169 (46%)

4,837 (49%)

 ≥ 80 years

515 (22%)

542 (21%)

553 (22%)

460 (18%)

2,070 (21%)

Charlson comorbidity index

0

1,469 (63%)

1,600 (62%)

1,523 (60%)

1,543 (61%)

6,135 (62%)

0.378

1

229 (10%)

287 (11%)

290 (11%)

264 (10%)

1,070 (11%)

 ≥ 2

630 (27%)

704 (27%)

718 (28%)

711 (28%)

2,763 (28%)

Year of diagnosis

2009–2012

1,228 (55%)

1,359 (52%)

1,198 (47%)

980 (39%)

4,825 (48%)

 < 0.001

2013–2016

1,040 (45%)

1,232 (48%)

1,333 (53%)

1,538 (61%)

5,143 (52%)

Civil status **

Married/registered partner

1,258 (54%)

1,416 (55%)

1,329 (53%)

1,309 (52%)

4,654 (47%)

0.348

Not married: never married, divorced, widowed

1,070 (46%)

1,175 (45%)

1,201 (47%)

1,208 (48%)

5,312 (53%)

Missing

0 (0%)

0 (0%)

1 (0%)

1 (0%)

2 (0%)

Highest level of commenced education **

Primary school (maximum 9 years)

909 (39%)

1,011 (39%)

965 (38%)

775 (31%)

3,660 (37%)

 < 0.001

Secondary school

(3–4 additional years)

945 (41%)

1,011 (39%)

993 (39%)

1,039 (41%)

3,988 (40%)

Higher education

459 (20%)

531 (20%)

550 (22%)

680 (27%)

2,220 (22%)

Missing

14 (1%)

38 (1%)

24 (1%)

24 (1%)

100 (1%)

Disposable income per family unit divided into annual quartiles. ***

1st quartile

676 (29%)

653 (25%)

624 (25%)

543 (22%)

2,496 (25%)

 < 0.001

2nd quartile

609 (26%)

646 (25%)

648 (26%)

584 (23%)

2,487 (25%)

3rd quartile

569 (24%)

685 (26%)

633 (25%)

605 (24%)

2,492 (25%)

4th quartile

474 (20%)

607 (23%)

625 (25%)

785 (31%)

2,491 (25%)

Missing

0 (0%)

0 (0%)

1 (0%)

1 (0%)

2 (0%)