Results
weight ≤
REGRESSION
A total of 269 adolescents were included and randomized to receive or not to receive the pre-notification letter before receiving the approval form and the questionnaires (Fig. Background characteristics of the adolescents born very preterm (birth weight ≤ 1500 g or gestational age < 32 weeks). Continuous variables were compared using the independent sample 
The rates of returned approval forms and questionnaires were higher in the pre-notification group than in the no pre-notification group as shown in Table The unadjusted results between the pre-notification and no pre-notification groups of adolescents. Comparisons between the groups were performed using the Pearson chi square. ORs and 95% CIs were computed using logistic regression