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Table 1 PIAAC-L design and sample size for each of the three follow-up waves

From: The PIAAC longitudinal study in Germany: rationale and design

Year Wave Unit Focus N RR (in %)
Gross Net
2014 Wave 1 Anchor person Extensive background information 5225 3758 71.9
   Additional house-hold members Extensive background information 4214a 2473  
   Household Household composition, living conditions 5225 3737  
2015 Wave 2 Anchor person Direct assessment of key competences (PIAAC numeracy and literacy; NEPS math and reading), PIAAC background variables and additional information 3758 3263 86.8
   Spouse or partner Direct assessment of key competences (NEPS math and reading), PIAAC background variables and additional information 2103 1368  
2016 Wave 3 Anchor person Basic cognitive competences (SOEP), extensive background information, alternative question operationalizations 3510b 2967 84.5
   Additional house-hold members Basic cognitive competences (SOEP), sociodemographic characteristics, alternative question operationalizations 3165 1915  
   Household Household composition, living conditions 3510 2946  
  1. N (Gross), number of persons (e.g. anchor persons) that were fielded; N (Net), number of realized interviews; RR, field response rate (gross/net) for anchor persons
  2. aThe gross sample for the additional adult household members is based on the number of adults in the households of participating anchor persons as indicated in the household protocol
  3. bA few specific non-interview dispositions, e.g. persons who were unavailable during field period in Wave 2, were included in the gross for Wave 3