Statistical comparisons were carried out across baseline data for those subjects for whom follow-up status was determined and the 857 eligible for follow-up but whose outcome could not be determined. At baseline those not located were a bit younger (38.8 vs. 37.9), less likely to be female (44.0% vs. 34.1%) or EA (74.4% vs. 62.9%), a bit less educated (12.9 vs. 12.6 years), more likely to identify with a religion (83.6% vs. 86.3%) and had higher SRET scores (7.2 vs. 7.6). Those not followed also reported higher maximum drinks (24.5 vs. 26.1), and a higher proportion with illicit drug use (81.0% vs. 89.3%).
