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Table 1 Characteristics of the sample at the four measurements waves of TRAILS

From: Benefits of extensive recruitment effort persist during follow-ups and are consistent across age group and survey method. The TRAILS study

    T1   T2   T3   T4
n 2,230 2,149 1,816c 1,881d
mean age (SD) 11.09 (0.56) 13.56 (0.53) 16.27 (0.73) 19.1 (0.60)
% girls 50.8 51 52.3 52.3
response rate (%) 76a 96.4b 81.4b 84.3b
  1. a Of the 2,935 eligible children asked to participate at T1.
  2. b Of the 2,230 included children at T1.
  3. c Non-responders at T3 include 2 deceased, 7 who were physically or psychologically unable to participate, 4 who were detained or moved abroad, and 31 untraceable or unreachable participants. Other non-responders refused participation or did not return any information (n = 372).
  4. d Non-responders at T4 include 5 deceased, 3 who were physically or psychologically unable to participate, and 1 detained participant, 16 untraceable and 43 unreachable participants, and 9 participants who moved abroad. Other non-responders refused participation or did not return any information (n = 272).