Table 2 Socio-demographic, drug use characteristics and treatment history characteristics associated with expected frequency of use among PWID willing to use SIS (n = 135)
Characteristic | Willing to Use (n = 135) | Expected frequency of use | Unadjusted OR (95% CI) | Adjusted OR (95% CI) | |
|---|---|---|---|---|---|
Always/ Usually (n = 87) n (%) | Sometimes/ Occasionally (n = 48) n (%) | ||||
Age, yr | |||||
 Median (IQR) | 34 (27–43) | 32 (25–41) | 35 (20–48) | 0.97 (0.94–1.01) | 0.99 (0.94–1.02) |
Gender | |||||
 Female | 57 (42.2) | 43 (75.4) | 14 (24.6) | 2.37* (1.12–5.03) | 2.44* (1.06–5.65) |
 Male | 78 (57.8) | 44 (56.4) | 34 (43.6) |  |  |
Ethnicity | |||||
 White | 31 (23.0) | 18 (58.1) | 13 (41.9) | 1.42 (0.63–3.24) | 1.08 (0.40–2.95) |
 Other | 104 (77.0) | 69 (66.3) | 35 (33.7) |  |  |
Housing | |||||
 Unstable/Homeless | 98 (72.6) | 64 (65.3) | 34 (34.7) | 1.15 (0.52–2.51) | 0.79 (0.31–1.97) |
 Stable | 37 (27.4) | 23 (62.2) | 14 (37.8) |  |  |
Sex work | |||||
 Yes | 30 (22.2) | 21 (70.0) | 9 (30.0) | 1.38 (0.57–3.31) | - |
 No | 105 (77.8) | 66 (62.9) | 39 (37.1) |  |  |
Any public injectinga | |||||
 Yes | 103 (76.3) | 71 (68.9) | 32 (31.1) | 2.22 (0.99–4.98) | 1.95 (0.78–4.88) |
 No | 32 (23.7) | 16 (50.0) | 16 (50.0) |  |  |
Any injecting alonea | |||||
 Yes | 38 (28.1) | 30 (78.9) | 8 (21.1) | 2.63* (1.09–6.34) | 2.59* (1.02–6.58) |
 No | 97 (71.9) | 57 (58.8) | 40 (41.2) |  |  |
Any help injectinga | |||||
 Yes | 53 (39.3) | 29 (54.7) | 24 (45.3) | 0.50 (0.24–1.03) | - |
 No | 82 (60.7) | 58 (70.7) | 24 (29.3) |  |  |
Syringe sharinga | |||||
 Yes | 13 (9.8) | 11 (84.6) | 2 (15.4) | 3.33 (0.70–15.57) | - |
 No | 120 (90.2) | 75 (62.5) | 45 (37.5) |  |  |
Daily opioidb injectinga | |||||
 Yes | 33 (24.4) | 27 (81.8) | 6 (18.2) | 3.15* (1.20–8.30) | 2.64 (0.94–7.36) |
 No | 102 (75.6) | 60 (58.8) | 42 (41.2) |  |  |
Daily cocaine injectinga | |||||
 Yes | 30 (22.2) | 24 (80.0) | 6 (20.0) | 2.67 (1.00–7.08) | - |
 No | 105 (77.8) | 63 (60.0) | 42 (40.0) |  |  |
Daily crack/rock cocaine injectinga | |||||
 Yes | 16 (11.9) | 13 (81.3) | 3 (18.7) | 2.64 (0.71–9.76) | - |
 No | 119 (88.1) | 74 (62.2) | 45 (37.8) |  |  |
Any Wellbutrin injectinga | |||||
 Yes | 50 (37.0) | 32 (64.0) | 18 (36.0) |  | - |
 No | 85 (63.0) | 55 (64.7) | 30 (35.3) | 0.97 (0.47–2.01) |  |
Any Ritalin or Biphentin injectinga | |||||
 Yes | 56 (41.5) | 39 (69.6) | 17 (30.4) | 1.48 (0.72–3.07) | - |
 No | 79 (58.5) | 48 (60.8) | 31 (39.2) |  |  |
Ever OD | |||||
 Yes | 57 (42.2) | 41 (71.9) | 16 (28.1) | 1.78 (0.86–3.71) | - |
 No | 78 (57.8) | 46 (59.0) | 32 (41.0) |  |  |
Drug treatment history | |||||
 Yes | 97 (71.9) | 64 (66.0) | 33 (34.0) | 1.27 (0.58–2.74) | - |
 No | 38 (28.1) | 23 (60.5) | 15 (39.5) |  |  |