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Table 1 Characteristics of out-of-treatment injection drug users, by age (N = 484)

From: Age and sharing of needle injection equipment in a cohort of Massachusetts injection drug users: an observational study

Characteristic Younger than 25 (N = 101) N (%) 25 or older (N = 383) N (%) p-value
Female 52 (51.5) 125 (32.6) <0.01
Race    <0.01
 Black 1 (1.0) 54 (14.1)  
 White, non-Hispanic 88 (87.1) 204 (53.3)  
 Hispanic 11 (10.9) 120 (31.3)  
 Other 1 (1.0) 5 (1.3)  
Born in US 95 (94.1) 332 (86.7) 0.04
Homeless 45 (44.6) 195 (50.9) 0.26
Education ≥ High School 74 (73.3) 257 (67.1) 0.24
Currently Working 17 (16.8) 34 (8.9) 0.02
PTSD Symptoms Score >50 59 (58.4) 211 (55.2) 0.57
Frequency of Cocaine/Crack Use    0.01
 No use 33 (33.3) 152 (39.9)  
 1-3 times per month 22 (22.2) 57 (15.0)  
 1-6 times per week 34 (34.4) 92 (24.1)  
 Daily 10 (10.1) 80 (21.0)  
Frequency of Heroin Use    0.60
 No use 5 (5.2) 10 (2.6)  
 1-3 times per month 12 (12.5) 44 (11.6)  
 1-6 times per week 11 (11.5) 50 (13.2)  
 Daily 68 (70.8) 276 (72.6)  
Frequency of Injection Drug Use    0.86
 1-3 times per month 15 (15.5) 56 (14.7)  
 1-6 times per week 14 (14.4) 48 (12.6)  
 Daily 68 (70.1) 277 (72.7)  
History of Exchanging Sex for Money 26 (25.7) 93 (26.5) 0.92
Any Needle Sharing, past 30 days 52 (51.5) 146 (38.1) 0.02
  1. The following variables had missing observations: PTSD symptoms (n = 1); cocaine/crack frequency (n = 4); heroin frequency (n = 8); injection frequency (n = 6).
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