TABLE 3.

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

	Univariate			Multivariate (N=133)†
	OR	95% CI	P	OR	95% CI	P
Gender
Male	Reference			Reference
Female	2.56	1.10–5.97	0.029*	2.35	0.72–7.64	0.156
Race‡
African American	Reference			Reference
Caucasian	2.20	0.88–5.49	0.091	2.21	0.64–7.58	0.207
Native American	7.50	0.92–60.90	0.059	7.35	0.48–113.36	0.153
Skin Popping
No	Reference			Reference
Yes	5.38	1.85–15.67	0.002*	3.31	0.63–17.29	0.156
Sharing needles
Never	Reference			Reference
Occasionally	0.21	0.027–1.65	0.138	0.24	0.024–2.33	0.216
Most of the time	1.40	0.14–14.08	0.774	0.74	0.014–39.52	0.881
Every time	4.21	0.25–69.71	0.316	…§	…	…
Kicking
Never	Reference			Reference
Occasionally	3.09	1.02–9.37	0.046*	4.88	1.09–21.90	0.039*
Most of the time	…§	…	…	…§	…	…
Every time	0.86	0.30–2.43	0.772	1.15	0.29–4.61	0.840
With whom do you inject?
Alone	Reference			Reference
Friends	1.37	0.45–4.18	0.576	1.66	0.42–6.47	0.467
Family member or partner	3.78	1.38–10.31	0.009*	4.06	0.99–16.58	0.051*
Clean skin with soap before injection
Never	Reference			Reference
Occasionally	1.71	0.63–4.67	0.295	1.79	0.41–7.90	0.443
Most of the time	3.91	0.99–15.52	0.052	6.50	0.72–59.00	0.096
Every time	0.84	0.096–7.31	0.873	0.16	0.0053–4.58	0.281
Clean hands before injection
Never	Reference			Reference
Occasionally	2.13	0.72–6.33	0.174	2.30	0.54–9.86	0.262
Most of the time	0.65	0.13–3.41	0.613	0.38	0.039–3.62	0.398
Every time	2.47	0.82–7.41	0.107	2.04	0.39–10.57	0.395

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.

^‡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.