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Table 1 Comparison between participants and non-participants at the early steps of the study

From: Recruitment in an indicated prevention program for externalizing behavior - parental participation decisions

Potential predictors Screening Eligible Pre-Test
  Participant
N= 2123
Decliner
n = 701
statistics Participant
N= 243
Decliner
n = 17
Statistics Participant
N= 155
Decliner
n = 88
statistics
  mean sd mean sd p (t-test) ORa mean sd mean sd p (t-test) ORa mean sd mean sd p (t-test) ORa
Age (Child) 4.06 0.86 4.15 0.84 0.015*   4.17 0.85 4.24 0.97 0.757   4.18 0.87 4.15 0.81 0.772  
SESb - - - - -   1.25 0.74 1.33 1.00 0.690   1.31 0.74 1.15 0.74 0.121  
Ts-ext 3.12 3.58 3.40 3.69 0.079   9.87 2.66 10.76 2.54 0.181   9.57 2.76 10.40 2.40 0.020*  
Ts-int 1.45 1.60 1.45 1.65 0.950   1.62 1.61 1.88 2.06 0.527   1.49 1.53 1.85 1.73 0.093  
Ts-total 5.46 4.59 5.75 4.81 0.157   13.12 4.00 14.24 4.21 0.270   12.66 3.89 13.93 4.09 0.017*  
Ps-ext - - - - -   7.42 2.63 5.94 2.44 0.025*   7.76 2.49 6.83 2.78 0.008**  
Ps-int - - - - -   1.90 1.67 1.35 1.06 0.187   1.97 1.75 1.76 1.51 0.341  
Ps-total - - - - -   11.02 4.00 9.24 3.63 0.076   11.49 3.90 10.21 4.06 0.018*  
  % % p 2 ) OR % % p 2 )   % % p 2 ) OR
Gender (male) 49.9 51.1 0.623   74.1 70.6 0.752   72.9 76.1 0.580  
SBDc 37.6 50.9 0.000** 1.69 44.4 35.3 0.462   40.0 52.3 0.064  
Ts burden by child 15.0 17.3 0.150   64.6 76.5 0.320   63.2 67.0 0.550  
Ts need for help 19.7 25.0 0.003** 1.34 70.4 70.6 0.988   71.2 69.0 0.710  
Ps burden by child - - -   38.3 17.6 0.088   47.1 23.0 0.000** .34
Ps need for help - - -   42.6 11.8 0.019* .18 49.3 30.6 0.005**  
  1. aOR = Odds Ratio (amount or increase in odds for decline with increasing values of the predictor); only if p ≤ 0.05 or for identified predictors in the logistic regression equation
  2. bSES = Socio Economic Status (calculated as mean of both parent's education and profession).
  3. cSBD = Social Burden of District (composite indicator calculated by the department of youth and family welfare of the City of Cologne) (very low, low, neither/nor, burden, strong burden); range in each sample '-2' to '2' dichotomized in: no or average SBD vs. moderate to high SBD
  4. Ts = Teachers view in screening; Ps = Parents view in screening; int- = Internalizing-score; ext = Externalizing-score; tot = Total-score
  5. * p ≤ 0.05; **p ≤ 0.01; significant (2-tailed) differences between participants and decliners at early steps of decision concerning project participation and indication for prevention,
  6. - Unattainable
  7. Bold characters: variables included in the logistic regression model