Determinants of Attrition to Follow-Up in a Multicentre Cohort Study in Children-Results from the IDEFICS Study

Table 1

Baseline Response and Baseline Characteristics of Children in the IDEFICS Study by Country.

	Estonia		Sweden		Germany		Belgium		Hungary		Italy		Spain		Cyprus		All
	𝑛	%	𝑛	%	𝑛	%	𝑛	%	𝑛	%	𝑛	%	𝑛	%	𝑛	%	𝑛	%
Region
Intervention	793	46.1%	902	49.9%	1179	57.1%	976	50.7%	1277	49.7%	1182	52.5%	798	53.0%	1373	57.7%	8480	52.3%
Control	926	53.9%	907	50.1%	886	42.9%	950	49.3%	1292	50.3%	1068	47.5%	709	47.0%	1007	42.3%	7745	47.7%
Sex
Male	850	49.4%	934	51.6%	1051	50.9%	978	50.8%	1286	50.1%	1165	51.8%	773	51.3%	1226	51.5%	8236	50.8%
Female	869	50.6%	875	48.4%	1014	49.1%	948	49.2%	1283	49.9%	1085	48.2%	734	48.7%	1154	48.5%	7962	49.1%
Age
Pre-school	859	50.0%	918	50.7%	876	42.4%	1043	54.2%	1039	40.4%	974	43.3%	715	47.4%	954	40.1%	7378	45.5%
School	860	50.0%	891	49.3%	1189	57.6%	883	45.8%	1530	59.6%	1276	56.7%	792	52.6%	1426	59.9%	8847	54.5%
Weight status
Obese	69	4.0%	36	2.0%	92	4.5%	44	2.3%	149	5.8%	438	19.5%	88	5.8%	211	8.9%	1127	6.9%
Overweight	178	10.4%	160	8.8%	237	11.5%	123	6.4%	288	11.2%	507	22.5%	223	14.8%	345	14.5%	2061	12.7%
Normal weight	1472	85.6%	1613	89.2%	1736	84.1%	1759	91.3%	2132	83.0%	1305	58.0%	1196	79.4%	1824	76.6%	13037	80.4%
Migration background
No	1572	91.4%	1433	79.2%	1304	63.1%	1726	89.6%	2398	93.3%	1846	82.0%	1310	86.9%	1404	59.0%	12993	80.1%
Partly	69	4.0%	180	10.0%	210	10.2%	72	3.7%	83	3.2%	329	14.6%	75	5.0%	377	15.8%	1395	8.6%
Full	11	0.6%	146	8.1%	493	23.9%	42	2.2%	19	0.7%	54	2.4%	86	5.7%	240	10.1%	1091	6.7%
Missing	67	3.9%	50	2.8%	58	2.8%	86	4.5%	69	2.7%	21	0.9%	36	2.4%	359	15.1%	746	4.6%
Educational level
Low	33	1.9%	32	1.8%	734	35.5%	78	4.0%	78	3.0%	484	21.5%	142	9.4%	78	3.3%	1659	10.2%
Medium-low	674	39.2%	331	18.3%	513	24.8%	513	26.6%	1107	43.1%	1338	59.5%	409	27.1%	285	12.0%	5170	31.9%
Medium-high	725	42.2%	180	10.0%	410	19.9%	430	22.3%	255	9.9%	0	0.0%	160	10.6%	518	21.8%	2678	16.5%
High	230	13.4%	1215	67.2%	321	15.5%	850	44.1%	1069	41.6%	410	18.2%	767	50.9%	1144	48.1%	6006	37.0%
Missing	57	3.3%	51	2.8%	87	4.2%	55	2.9%	60	2.3%	18	0.8%	29	1.9%	355	14.9%	712	4.4%
Family status
Two parents	1414	82.3%	1606	88.8%	1675	81.1%	1677	87.1%	2036	79.3%	1477	65.6%	1322	87.7%	1086	45.6%	12293	75.8%
Single parent	214	12.4%	153	8.5%	309	15.0%	184	9.6%	394	15.3%	651	28.9%	132	8.8%	391	16.4%	2482	15.3%
Missing	91	5.3%	50	2.8%	81	3.9%	65	3.4%	139	5.4%	122	5.4%	53	3.5%	903	37.9%	1504	9.3%
Well being
Low	217	12.6%	156	8.6%	333	16.1%	272	14.1%	847	33.0%	543	24.1%	210	13.9%	449	18.9%	3027	18.7%
Medium-low	414	24.1%	352	19.5%	436	21.1%	371	19.3%	906	35.3%	617	27.4%	442	29.3%	427	17.9%	3965	24.4%
Medium-high	524	30.5%	646	35.7%	666	32.3%	668	34.7%	598	23.3%	649	28.8%	541	35.9%	356	15.0%	4648	28.6%
High	406	23.6%	540	29.9%	314	15.2%	431	22.4%	48	1.9%	273	12.1%	183	12.1%	97	4.1%	2292	14.1%
Missing	158	9.2%	115	6.4%	316	15.3%	184	9.6%	170	6.6%	168	7.5%	131	8.7%	1051	44.2%	2293	14.1%
Weekly screen time
≤7 hours	312	18.2%	444	24.5%	756	36.6%	632	32.8%	820	31.9%	622	27.6%	586	38.9%	502	21.1%	4674	28.8%
7 to ≤14 hours	603	35.1%	839	46.4%	699	33.8%	732	38.0%	937	36.5%	817	36.3%	554	36.8%	805	33.8%	5986	36.9%
>14 hours	717	41.7%	446	24.7%	448	21.7%	466	24.2%	706	27.5%	721	32.0%	288	19.1%	625	26.3%	4417	27.2%
Missing	87	5.1%	80	4.4%	162	7.8%	96	5.0%	106	4.1%	90	4.0%	79	5.2%	448	18.8%	1148	7.1%
Junk food
Never	121	7.0%	276	15.3%	30	1.5%	26	1.3%	227	8.8%	184	8.2%	126	8.4%	84	3.5%	1074	6.6%
Occasionally	778	45.3%	1160	64.1%	431	20.9%	534	27.7%	1132	44.1%	831	36.9%	810	53.7%	673	28.3%	6349	39.1%
Often	588	34.2%	272	15.0%	1369	66.3%	1118	58.0%	937	36.5%	979	43.5%	465	30.9%	477	20.0%	6205	38.2%
Missing	232	13.5%	101	5.6%	235	11.4%	248	12.9%	273	10.6%	256	11.4%	106	7.0%	1146	48.2%	2597	16.0%
Soft drink available
Yes	423	24.6%	32	1.8%	1060	51.3%	486	25.2%	579	22.5%	321	14.3%	64	4.2%	158	6.6%	3123	19.2%
No	1224	71.2%	1690	93.4%	896	43.4%	1300	67.5%	1892	73.6%	1906	84.7%	1395	92.6%	930	39.1%	11233	69.2%
Missing	72	4.2%	87	4.8%	109	5.3%	140	7.3%	98	3.8%	23	1.0%	48	3.2%	1292	54.3%	1869	11.5%
Sleep duration
≤11 hours	1289	75.0%	848	46.9%	937	45.4%	209	10.9%	865	33.7%	1578	70.1%	464	30.8%	908	38.2%	7098	43.7%
>11 hours	42	2.4%	366	20.2%	649	31.4%	199	10.3%	36	1.4%	64	2.8%	40	2.7%	45	1.9%	1441	8.9%
Missing	388	22.6%	595	32.9%	479	23.2%	1518	78.8%	1668	64.9%	608	27.0%	1003	66.6%	1427	60.0%	7686	47.4%
Item nonresponse
None	1490	86.7%	1644	90.9%	1649	79.9%	1628	84.5%	2276	88.6%	1907	84.8%	1299	86.2%	1150	48.3%	13043	80.4%
Low	159	9.2%	104	5.7%	296	14.3%	204	10.6%	214	8.3%	295	13.1%	163	10.8%	249	10.5%	1684	10.4%
High	70	4.1%	61	3.4%	120	5.8%	94	4.9%	79	3.1%	48	2.1%	45	3.0%	981	41.2%	1498	9.2%
Baseline response	54.5%		65.6%		48.2%		58.3%		43.7%		60.0%		41.4%		49.9%		51.4%