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Table 1 Characteristics of study participants assessed for willingness to take an opioid antagonist (N = 657)

From: Factors associated with willingness to take extended release naltrexone among injection drug users

Characteristic

Willingness

Odds ratio (95% CI £ )

p value

No = 315 (%)

Yes = 342 (%)

Age [Median, (IQR ¥ )]

49 (41–54)

46 (40–51)

0.98 (0.96–1.00)

0.015

Gender

    

 Male

209 (66.3)

199 (58.2)

  

 Female

106 (33.7)

143 (41.8)

1.42 (1.03–1.95)

0.032

Caucasian ethnicity

    

 No

102 (32.4)

158 (46.2)

  

 Yes

213 (67.6)

184 (53.8)

0.56 (0.41–0.77)

< 0.001

Daily heroin injection*

    

 No

268 (85.1)

270 (79.0)

  

 Yes

47 (14.9)

71 (20.8)

1.50 (1.00–2.25)

0.050

Daily cocaine injection*

    

 No

289 (91.7)

319 (93.3)

  

 Yes

26 (8.3)

23 (6.7)

0.80 (0.45–1.44)

0.457

Daily crack smoking*

    

 No

251 (79.7)

279 (81.6)

  

 Yes

64 (20.3)

63 (18.4)

0.89 (0.60–1.30)

0.538

Homelessness*

    

 No

273 (86.7)

295 (86.3)

  

 Yes

42 (13.3)

46 (13.5)

1.01 (0.65–1.59)

0.953

Sex work*

    

 No

293 (93.0)

312 (91.2)

  

 Yes

22 (7.0)

30 (8.8)

1.28 (0.72–2.27)

0.397

HIV positive

    

 No

189 (60.0)

198 (57.9)

  

 Yes

126 (40.0)

144 (42.1)

1.09 (0.80–1.49)

0.584

Participation in drug treatment**

    

 No

257 (81.6)

275 (80.4)

  

 Yes

57 (18.1)

64 (18.7)

1.05 (0.71–1.56)

0.812

  1. NOTE: Percentages do not necessarily sum to 100% due to missing data or rounding error.
  2. *Activities in last 6 months.
  3. **Defined as drug and/or alcohol treatment other than a methadone program.
  4. ¥IQR = inter-quartile range.
  5. £CI = confidence interval.