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Table 3 Multivariate multinomial logistic regression analysis predicting T1-hard-to-recruit-retainers, T1-easy-to-recruit-retainers, T1-easy-to-recruit-dropouts and T1-hard-to-recruit-dropouts. Retention and dropout observed at T4

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

  T1-easy-to-recruit-retainer T1-hard-to-recruit-retainer (ref.) T1-easy-to-recruit-dropout T1-hard-to-recruit-dropout
  ( n  = 1,549) ( n  = 55) ( n  = 222) ( n  = 33)
  n(%) OR 95% CI n(%) n(%) OR 95% CI n(%) OR 95% CI
T1 Sociodemo-graphics
Non-western immigrant 102 (6.6) 0.40* 0.19-0.86 10 (18.2) 40 (18.0) 1.03 0.47-2.29 14 (42.4) 2.72 0.98-7.58
(univariate effects)   0.32* 0.16-0.65    0.99 0.46-2.13   3.32* 1.25-8.77
Lower education mother (≤lower tracks of sec. educ.) 491 (31.7) 0.44* 0.24-0.79 33 (60.0) 132 (59.5) 1.06 0.56-2.00 22 (66.7) 1.25 0.48-3.24
(univariate effects)   0.31* 0.18-0.54    0.98 0.54-1.79   1.33 0.54-3.29
Low family income (<€1,135) 183 (11.8) 0.48* 0.25-0.91 17 (30.9) 60 (27.0) 0.83 0.42-1.65 15 (45.5) 1.35 0.51-3.57
(univariate effects)   0.30* 0.17-0.54    0.83 0.44-1.58   1.86 0.76-4.55
Low IQ (wisc < 85) 213 (13.8) 0.55 0.30-1.03 18 (32.7) 65 (29.3) 0.88 0.45-1.73 13 (39.4) 1.08 0.41-2.81
(univariate effects)   0.33* 0.18-0.59    0.85 0.45-1.60   1.34 0.55-3.28
  mean (SD) OR 95% CI mean (SD) mean (SD) OR 95% CI mean (SD) OR 95% CI
T1 Psychopathology
CBCL Internalizing problems 0.25 (0.19) 1.33 0.96-1.84 0.24 (0.17) 0.25 (0.20) 1.07 0.76-1.52 0.30 (0.24) 1.34 0.84-2.16
(univariate effects)   1.00 0.76-1.31    1.03 0.76-1.38   1.26 0.85-1.86
CBCL Externalizing problems 0.23 (0.19) 0.70* 0.53-0.91 0.31 (0.27) 0.30 (0.26) 0.95 0.71-1.27 0.28 (0.23) 0.74 0.47-1.17
(univariate effects)   0.71* 0.56-0.89    0.97 0.76-1.23   0.89 0.61-1.30
  1. *p < .05; Odds ratios (OR) and 95% confidence intervals (CI) from multivariate multinomial logistic regression analysis; CBCL = Child Behavior Checklist (parent report); CBCL scores standardized; univariate effects of single multinomial regression analyses italicized. Nagelkerke  = 0.145.