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. Author manuscript; available in PMC: 2012 Apr 1.
Published in final edited form as: Ann Epidemiol. 2011 Apr;21(4):280–289. doi: 10.1016/j.annepidem.2010.11.007

Table 4.

Evaluating Sampling Biases and the Independence of Seeds and Peer Recruits in an RDS Sample of Illicit Drug Users in New York City, 2006-2009

Seeds
(n=46)
Recruits
(n=357)
Networks
(mean number of
drug-using
network
members=1.52)
N=534
P-value for
difference between
networks and
recruits (2-sided)
P-value for
independence of
seeds and
recruits (2-sided)
Gender <0.01 0.11
Female (%) 34.8 23.9 36.9
Male (%) 65.2 76.1 63.1
Race/Ethnicity 0.2214 0.01
Hispanic (%) 54.4 34.2 29.4
Black (%) 43.5 55.7 61.6
White/Other (%) 2.2 10.1 9.1
Median age 33.5 34 35 <0.01 0.62
≥ High School (%) 37.0 35.3 62.6 <0.01 0.82
Inject (%) 23.9 7.3 7.7 0.81 <0.01
Smoke crack (%) 76.1 85.4 77.1 <0.01 0.10
Snort heroin (%) 50.0 43.8 21.8 <0.01 0.43

Abbreviations: Respondent Driven Sampling (RDS)