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

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

  CCN database
(n = 104,519)a
General population
(n = 104,519)
Originb (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)
  1. Values are given as median (IQR) unless otherwise specified
  2. 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
  3. 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