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Table 3 Univariate effects of different predictors of participation upon respondent retention at ages 16, 18 and 20 (as expected from the literature, all the predictors were significant, except for receiving the SHARE teacher-delivered sex education at school)

From: Retaining young people in a longitudinal sexual health survey: a trial of strategies to maintain participation

   Completed questionnaire at age 16 (Wave 2) Completed questionnaire at age 18 (Wave 3) Completed questionnaire at age 20 (Wave 4)
   Odds ratio (95% CI) Odds ratio (95% CI) Odds ratio (95% CI)
All pupils (N = 8430)        
Sex female 1.94 (1.76, 2.13) 2.65 (2.42, 2.91) 2.37 (2.16, 2.61)
  male 1   1   1  
Father manual versus non manual worker non-manual 2.27 (2.01, 2.58) 1.49 (1.34, 1.66) 1.32 (1.18, 1.48)
  missing data 0.60 (0.54, 0.67) 0.82 (0.73, 0.92) 0.78 (0.70, 0.88)
  manual 1   1   1  
Mother manual versus non manual worker non-manual 1.99 (1.76, 2.26) 1.34 (1.19, 1.51) 1.26 (1.11, 1.42)
  missing data 0.69 (0.61, 0.77) 0.79 (0.70, 0.89) 0.78 (0.69, 0.89)
  manual 1   1   1  
Family composition lives with mum only 0.53 (0.47, 0.59) 0.80 (0.72, 0.89) 0.74 (0.66, 0.82)
  lives with dad only 0.40 (0.32, 0.51) 0.48 (0.36, 0.63) 0.45 (0.34, 0.61)
  lives with neither parent 0.31 (0.21, 0.46) 0.41 (0.25, 0.67) 0.55 (0.34, 0.89)
  missing data 0.03 (0.02, 0.05) 0.23 (0.16, 0.31) 0.26 (0.19, 0.37)
  lives with both parents 1   1   1  
Parental monitoring low parental monitoring 0.69 (0.63, 0.76) 0.63 (0.57, 0.69) 0.69 (0.63, 0.76)
  high parental monitoring 1   1   1  
Pocket Money more than £20 per week    0.87 (0.8, 0.89) 0.89 (0.87, 0.90)
  less than £20 per week N/A*   1   1  
Sexual intercourse by 16 years* has had sexual intercourse    0.91 (0.81, 1.01) 0.87 (0.78, 0.98)
  missing data    0.26 (0.23, 0.29) 0.30 (0.27, 0.34)
  has not had sexual intercourse N/A*   1   1  
Early school leaving status leavers 0.15 (0.14, 0.17) 0.55 (0.50, 0.62) 0.65 (0.58, 0.73)
  non-leavers 1   1   1  
Drunkenness gets drunk once a month or more N/A*   0.74 (0.67, 0.81) 0.81 (0.73, 0.90)
  never or rarely gets drunk    1   1  
The SHARE teacher delivered sex education intervention Received SHARE 0.91 (0.82, 1.01) 0.92 (0.84, 1.01) 0.92 (0.84, 1.01)
  Not received SHARE 1   1   1  
  1. *Some analysis is N/A at age 16. This is because the variables with N/A were themselves collected at age 16, thus we can not look at the impact of these on participation rates at 16, because we do not know the information required for the non-responders. The other variables we were able to use were collected at age 14, before the individuals did not respond, or in the case of early school leaving were provided to us by the school the participants' attended.