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Table 1 Cohort sample size, measurement timepoints and missingness

From: Understanding why apprentices consider dropping out: longitudinal prediction of apprentices’ workplace interest and anxiety

  Beginning 1st year 2nd year 3rd year
T1a T2 T3 T4 T5 T6
Cohort 1 (n = 548) M1 M2 M3 M4   
Cohort 2 (n = 646)   M1 M2 M3 M4  
Cohort 3 (n = 731)    M1 M2 M3 M4
Cohort 4 (n = 462)     M1 M2 M3
Responses 493 771 1212 1225 956 576
Unplanned missing 55 423 713 1162 883 617
Unplanned missing (%) 10% 35% 37% 49% 48% 52%
Planned missing 1839 1193 462 0 548 1194
  1. aApprentices’ initial attendance at trade school (less than 1 month)