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Table 8 Multiple multinomial logistic regression analysis predicting T4-easy-to-recruit, T4-hard-to-recruit, T4-non-responder, and drop-out since T2 or T3

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

  T4-easy-to-recruit (n = 1,359) (ref.) T4-hard-to-recruit (n = 213) T4-non-responder (n = 98) Drop-out since T2 or T3 (n = 150)
  n(%) n(%) OR 95% CI n(%) OR 95% CI n(%) OR 95% CI
T1 Recruitment Effort
Hard to recruit 42 (3.1) 8 (3.8) 0.98 0.44-2.17 13 (13.3) 2.51* 1.21-5.18 18 (12.0) 2.65* 1.42-4.96
(univariate effects)    1.22 0.57-2.64   4.80* 2.48-9.28   4.28* 2.39-7.64
T1 Socio-demographics
Girl 747 (55.0) 66 (31.0) 0.41* 0.30-0.56 40 (40.8) 0.64* 0.41-1.00 72 (48.0) 0.84 0.59-1.20
(univariate effects)    0.37* 0.27-0.50   0.57* 0.37-0.56   0.76 0.54-1.06
Non-western immigrant 87 (6.4) 23 (10.8) 1.66 1.00-2.76 23 (23.5) 3.11* 1.76-5.47 29 (19.3) 2.67* 1.62-4.39
(univariate effects)    1.77* 1.09-2.87   4.48* 2.68-7.51   3.50* 2.21-5.55
Parents divorced 248 (18.2) 33 (26.8) 1.45 0.99-2.12 33 (33.7) 1.47 0.88-2.47 32 (21.3) 0.81 0.51-1.31
(univariate effects)    1.64* 1.17-2.28   2.27* 1.46-3.54   1.22 0.80-1.84
Lower educ.mother (≤lower tracks of sec. educ.) 422 (31.1) 88 (41.3) 1.30 0.94-1.78 60 (61.2) 2.24* 1.42-3.54 88 (58.7) 2.52* 1.75-3.64
(univariate effects)    1.56* 1.16-2.10   3.51* 2.30-5.35   3.15* 2.23-4.45
Low family income (<€1,135) 157 (11.6) 40 (18.8) 1.23 0.78-1.92 34 (34.7) 1.88* 1.09-3.24 38 (25.3) 1.63* 1.01-2.64
(univariate effects)    1.77* 1.21-2.60   4.07* 2.60-6.37   2.60* 1.74-3.89
Low IQ (wisc < 85) 180 (13.2) 44 (20.7) 1.43 0.96-2.12 37 (37.8) 2.27* 1.40-3.67 39 (26.0) 1.43 0.93-2.20
(univariate effects)    1.71* 1.18-2.46   3.97* 2.57-6.15   2.30* 1.55-3.42
T1 Psycho-pathology mean (SD) mean (SD) OR 95% CI mean (SD) OR 95% CI mean (SD) OR 95% CI
CBCL Int 0.25 (0.19) 0.24 (0.21) 0.81* 0.67-0.98 0.25 (0.20) 0.75* 0.58-0.97 0.26 (0.21) 0.96 0.78-1.18
(univariate effects)    0.97 0.84-1.12   1.00 0.81-1.23   1.09 0.92-1.28
CBCL Ext 0.22 (0.19) 0.29 (0.21) 1.38* 1.17-1.62 0.31 (0.27) 1.43* 1.14-1.79 0.29 (0.24) 1.29* 1.06-1.56
(univariate effects)    1.38* 1.21-1.57   1.48* 1.24-1.76   1.34* 1.15-1.57
YSR Int 0.37 (0.24) 0.33 (0.21) 0.88 0.75-1.03 0.36 (0.25) 0.88 0.71-1.10 0.33 (0.24) 0.77* 0.64-0.94
(univariate effects)    0.85* 0.73-0.99   0.96 0.78-1.17   0.85 0.71-1.02
  1. *p < .05; Odds ratios (OR) and 95% confidence intervals (CI) from multivariate multinomial logistic regression analysis; CBCL = Child Behavior Checklist (parent report); YRS = Youth Self Report; Int = Internalizing; Ext = Externalizing; CBCL and YSR scores standardized; univariate effects of single multinomial regression analyses italicized. Nagelkerke R² = 0.159.
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