TABLE 4.

Univariate and Multivariate Analysis of Factors Associated With a Current Chronic Wound Among Clients of the Baltimore City Needle Exchange Program

	Univariate			Multivariate (N=104)†
	OR	95% CI	P	OR	95% CI	P
Age (years)‡	1.04	1.00–1.08	0.029*	0.88	0.78–0.99	0.032*
Race§
African American	Reference			Reference
Caucasian	0.67	0.29–1.56	0.357	0.38	0.053–2.74	0.337
Native American	10.6	1.03–109.45	0.047*	128.1	1.86–8800.41	0.025*
Time injecting drugs (years)
≤ 2	Reference			Reference
3–8	1.22	0.10–14.69	0.877	2.19	0.058–82.49	0.671
9–14	2.47	0.23–26.46	0.455	3.03	0.051–180.90	0.595
≥ 15	4.94	0.62–39.61	0.132	76.2	1.55–3753.56	0.029*
Skin Popping
No	Reference			Reference
Yes	2.63	0.88–7.84	0.082	3.12	0.41–23.82	0.273
Inject into leg
No	Reference			Reference
Yes	3.12	1.34–7.30	0.009*	3.17	0.56–18.10	0.194
Filter use
No	Reference			Reference
Yes	0.15	0.024–0.94	0.043*	0.11	0.0014–8.07	0.312
Cleaning skin before injection
Do not clean	Reference			Reference
Water	0.23	0.026–2.00	0.182	0.018	0.00054–0.60	0.025*
Soap/Water	0.19	0.022–1.67	0.135	0.14	0.0058–3.18	0.215
Alcohol	0.60	0.24–1.49	0.269	0.061	0.0064–0.58	0.015*
Bleach	…**	…	…	…**	…	…
Saliva	2.50	0.14–43.97	0.531	0.22	0.0051–9.47	0.431
Multiple	0.83	0.077–9.00	0.881	0.14	0.0043–4.63	0.272
Cleaning needle with bleach upon reuse
Water	Reference			Reference
Bleach	4.44	1.36–14.51	0.014*	17.9	2.14–149.95	0.008*

Abbreviations: OR, odds ratio; CI, confidence interval.

^†This multivariate model includes variables from the univariate analysis that had at least one category with P ≤ 0.150.

^‡Continuous variable.

^§Race categories of “Other” (Hispanic, Asian and multiple) had too few observations for both univariate and multivariate logistic regression.

^**Insufficient observations for univariate or multivariate logistic regression.

^*P ≤ 0.05 by logistic regression.