3.3 Survey Attrition

The attrition of the sample is shown below:

Table 3.6: Attrition of ELSOC samples between waves

	Achieved Sample		Attrition Rate
Measurement	Original Sample	Refreshment Sample	Original Sample	Refreshment Sample
2016	2927
2017	2473		15.5%
2018	2229	1519	9.9%
2019	2153	1264	3.4%	16.8%
2021	1739	1001	19.2%	20.8%

• By gender:

Table 3.7: Attrition of ELSOC samples between waves, by gender

	Achieved Sample		Attrition Rate
Measurement	Male	Female	Male	Female
Original Sample
2016	1163	1764
2017	953	1520	18.1%	13.8%
2018	841	1387	11.8%	8.8%
2019	807	1346	4.0%	3.0%
2021	631	1108	21.8%	17.7%
Refreshment Sample
2018	607	912
2019	482	782	20.6%	14.3%
2021	378	623	21.6%	20.3%

• By age segment:

Table 3.8: Attrition of ELSOC samples between waves, by age segment

	Achieved Sample				Attrition Sample
Measurement	19-29	30-49	50-64	65 or over	19-29	30-49	50-64	65 or over
Original Sample
2016	506	1157	839	425
2017	407	962	734	370	19.6%	16.9%	12.5%	12.9%
2018	340	863	687	338	16.5%	10.3%	6.4%	8.6%
2019	327	838	666	322	3.8%	2.9%	3.1%	4.7%
2021	269	685	546	239	17.7%	18.3%	18.0%	25.8%
Refreshment Sample
2018	341	579	418	181
2019	271	472	369	152	20.5%	18.5%	11.7%	16.0%
2021	216	391	282	112	20.3%	17.2%	23.6%	26.3%

• By educational level:

Table 3.9: Attrition of ELSOC samples between waves, by educational level

	Achieved Sample				Attrition Rate
Measurement	Primary	Secondary	Technical	University	Primary	Secondary	Technical	University
Original Sample
2016	656	1251	483	535
2017	580	1062	396	434	11.6%	15.1%	18.0%	18.9%
2018	512	977	358	380	11.7%	8.0%	9.6%	12.4%
2019	490	953	341	368	4.3%	2.5%	4.7%	3.2%
2021	363	757	283	336	25.9%	20.6%	17.0%	8.7%
Refreshment Sample
2018	283	633	253	347
2019	254	537	206	264	10.2%	15.2%	18.6%	23.9%
2021	167	426	175	233	34.3%	20.7%	15.0%	11.7%