Table 2.

Homophily, Cross-group Recruitment, Mean Number of Drug-Using Network Members, and Equilibrium Statistics in a Sample of Illicit Drug Users in New York City

	Homophily	Cross- group Recruitment (%)	Mean Number of Drug- Using Network Members (adjusted)	# waves required to reach equilibrium	Equilibrium sample %	RDS- weighted population estimate	Sample estimate %	2-sided P-value (population vs. sample estimate)
Gender								0.60
Female	0.277	55.7	1.333	4	22.6	23.1	24.9
Male	0.297	16.2	1.371	5	77.4	76.9	75.1
Race/Ethnicity								0.44
Hispanic	0.384	38.7	1.383	5	37.2	36.6	36.5
Black	0.327	31.3	1.341	5	52.6	53.4	54.4
White/Other	0.080	82.9	1.389	4	10.1	9.9	9.1
Education								0.44
<High School	0.065	32.6	1.353	2	64.8	65.1	64.3
≥High School	0.079	60.0	1.373	2	35.2	34.9	35.7
Income								0.48
≤ 10,000	0.037	14.2	1.360	2	85.1	85.3	85.2
> 10,000	0.049	81.1	1.377	2	14.9	14.7	14.8
Age								0.11
18-27	0.056		1.506	3	17.8	17.6	18.2
28-30	0.036		2.285	3	13.7	11.9	14.3
31-34	0.086		1.468	3	19.6	19.9	19.2
35-36	0.060		1.423	3	13.9	14.3	14.5
37-38	0.014		1.472	3	15.5	15.8	17.5
39-40	0.041		1.426	3	19.4	20.5	19.2
Homeless in last 6 months								0.72
No	0.170	59.6	1.412	3	29.7	28.6	30.2
Yes	0.125	25.0	1.339	3	70.3	71.4	69.8
Injection status								0.35
NIDU	0.016	6.5	1.349	2	92.6	93.3	90.6
IDU	0.123	81.8	1.514	3	7.4	6.7	9.4
HIV status								0.13
Negative	0.552	3.0	1.368	7	93.2	93.3	90.1
Positive	0.560	42.5	1.393	12	6.8	6.7	9.9
Heroin use (past 6 months)								0.59
No	0.348	31.1	1.349	4	51.9	52.3	53.3
Yes	0.359	33.3	1.373	4	48.1	47.7	46.7
Cocaine use (past 6 months)								0.43
No	0.178	63.1	1.321	4	22.6	23.3	22.5
Yes	0.208	18.4	1.372	3	77.4	76.6	77.5
Crack use (past 6 months)								0.50
No	0.191	69.8	1.415	4	15.2	14.6	15,8
Yes	0.151	12.4	1.349	3	84.8	85.4	84.2

Abbreviations: HIV, Human Immunodeficiency Virus; IDU, Injection Drug User; NIDU, Non-injection Drug User; RDS, Respondent Driven Sampling