Table 1

Baseline characteristics of participants according to broader country of origin categories of Dutch, LMIC or HIC in the Netherlands

Variable	Name	Total*	%	Dutch*	%	LMIC origin*	%	HIC origin*	%
Migration background
	Dutch origin	13 183	75.7
	LMIC origin	2403	13.8
	HIC origin	1835	10.5
Sex
	Female	8766	50.3	6618	50.2	1198	49.9	950	51.8
	Male	8655	49.7	6565	49.8	1205	50.1	885	48.2
Age categories (years)
	< 50	10 142	58.2	7145	54.2	1865	77.6	1132	61.7
	50–54	1287	7.4	1001	7.6	154	6.4	132	7.2
	55–59	1267	7.3	1017	7.7	130	5.4	120	6.6
	60–64	1144	6.6	945	7.2	95	3.9	104	5.7
	65–69	1014	5.8	854	6.5	64	2.6	96	5.3
	70–74	986	5.7	847	6.4	43	1.8	96	5.2
	75–79	662	3.8	572	4.3	28	1.1	62	3.4
	80–84	473	2.7	405	3.1	17	0.7	51	2.8
	85–89	284	1.6	251	1.9	6	0.3	27	1.5
	90–94	126	0.7	113	0.9	2	0.1	11	0.6
	95+	36	0.2	33	0.2	0	0	3	0.2
Region of residence
	Main municipal health regions	4869	28.0	3004	22.8	1210	50.4	655	35.7
	Rest of Netherlands	12 549	72.0	10 177	77.2	1193	49.6	1180	64.3
Residential care status
	Residential care	270	1.5	231	1.8	14	0.6	25	1.3
	Non-residential care	187	1.1	148	1.1	23	0.9	17	0.9
	Not in care	16 964	97.4	12 803	97.1	2367	98.5	1794	97.8
Household size (in persons)
	1 person	3396	19.5	2481	18.8	439	18.3	477	26
	2 people	5309	30.5	4279	32.5	451	18.8	579	31.5
	3 people	2767	15.9	2031	15.4	431	17.9	305	16.6
	4 people	3781	21.7	2920	22.2	529	22	332	18.1
	5 people +	2167	12.4	1471	11.2	554	23	142	7.7
Household wealth (quantiles)
	1 (highest)	3103	17.8	2714	20.6	125	5.2	264	14.4
	2	3318	19.0	2829	21.5	216	9	273	14.9
	3	3370	19.3	2777	21.1	303	12.6	290	15.8
	4	3218	18.5	2422	18.4	467	19.4	328	17.9
	5 (lowest)	3393	19.5	2009	15.2	994	41.4	390	21.3
	Unknown	1020	5.9	432	3.3	298	12.4	290	15.8

First, countries of origin were broadly classified based on World Bank’s ‘LMIC’ and ‘HIC’ categories. Second, the countries were classified into more specific subgroups, that is, five countries of origin with the largest number of inhabitants (Turkey, Morocco, Suriname, Dutch Antilles and Indonesia), and the remain groups into other LMIC origin and other HIC origin.
*Population per first March 2020 times 1000.
HIC, high-income countries; LMIC, low-income and middle-income country.