Fig. 1.

Degree estimates from two RDS surveys of PWIDs in Bristol, UK [20, 31], the question was ‘In the last 30 days how many people who inject drugs have you spoken to who you know by name and who also know you by name?’. (A) The full distributions. (B) Just degrees less than 100. The 2006 and 2009 distributions were very similar: the mean degree in both years was 39, with a standard deviation of 66.5 in 2006 and 60.0 in 2009.