To identify factors associated with hazard of the opportunity to use cannabis survival data (time in years, starting from birth) were used for analysis of 3,798 participants who had provided information on opportunity to use cannabis. Failure event was opportunity to use cannabis, and 3398 failure events were observed (one participant was excluded from analysis, see description below). Due to missing covariate data, 3,763 participants were included in the final model (3367 failure events).
