Routine clinical care data from thirteen cardiac outpatient clinics: design of the Cardiology Centers of the Netherlands (CCN) database

Table 3 Sociodemographic characteristics of the CCN database and a sample of the general population matched on year of birth and sex

	CCN database (n = 104,519)^a	General population (n = 104,519)
Origin^b (n, %)
Native Dutch	80,692 (77.2)	74,042 (70.8)
First generation immigrant	15,731 (15.1)	24,592 (23.5)
Second generation immigrant	8096 (7.7)	5884 (5.6)
Annual personal income (€)	27,914 [14,822–47,344]	22,270 [11,900–38,758]
Annual personal income groups (n, %)
Negative or zero	4760 (4.6)	5701 (5.5)
< €20.000	33,209 (31.8)	33,048 (31.6)
€20.000—€50.000	42,325 (40.5)	33,906 (32.4)
€50.000—€100.000	18,204 (17.4)	10,530 (10.1)
€100.000—€200.000	4197 (4.0)	1675 (1.6)
≥ €200.000	1121 (1.1)	337 (0.3)
Not available	703 (0.7)	19,321 (18.5)

Values are given as median (IQR) unless otherwise specified
^aYear of birth could not be re-calculated for 160 study participants, so these could not be matched with the general population and are thus removed from this table
^bOrigin was defined as (i) Native Dutch; both parents born in the Netherlands, (ii) First generation immigrant; person born outside the Netherlands with at least one parent born outside the Netherlands, (iii) Second generation immigrant; person born in the Netherlands with at least one parent born outside the Netherlands

ISSN: 1471-2261