Group-level analyses: risk behaviour and harm reduction intervention uptake of study sample, by survey.

aX2 test for trend for proportions, Kruskal-Wallis test for medians, ANOVA test for means.bAmong those who cited needle exchange as the reason for visiting the service on the day of recruitment.cAmong those who reported injecting in the last 6 months.dSee methods for details. P-values have not been calculated for the second measure of IEP coverage – because of the large numbers, even clinically insignificant changes would be statistically significant.