Table 1 Baseline characteristics of SAPPHIRE participants by number of completed visits, N (%)
|  | Total | Baseline only | 2 visits | 3 visits | 4 visits | 5 visits | χ2 p-value |
|---|---|---|---|---|---|---|---|
Characteristic | n = 250 | n = 34 | n = 19 | n = 46 | n = 48 | n = 103 | |
Age, mean (SD) | 35.7 (9.0) | 33.3 (7.8) | 31.7 (8.0) | 37.1 (10.1) | 32.6 (8.2) | 37.9 (8.7) | < 0.001a |
Race/ethnicity | 0.133 | ||||||
 White, non-Hispanic | 166 (66.4) | 24 (70.6) | 13 (68.4) | 26 (56.5) | 27 (56.3) | 76 (73.8) |  |
 Black, non-Hispanic | 57 (22.8) | 6 (17.6) | 4 (21.1) | 16 (34.8) | 11 (22.9) | 20 (19.4) |  |
 Hispanic or other | 27 (10.8) | 4 (11.8) | 2 (10.5) | 4 (8.7) | 10 (20.8) | 7 (6.8) |  |
Relationship status | 0.050 | ||||||
 In a relationship/married | 84 (33.6) | 8 (23.5) | 3 (15.8) | 17 (37.0) | 12 (25.0) | 44 (42.7) |  |
 Single | 165 (66.0) | 26 (76.5) | 15 (78.9) | 29 (63.0) | 36 (75.0) | 59 (57.3) |  |
≥ 1 financial dependents | 95 (38.0) | 10 (29.4) | 10 (52.6) | 16 (34.8) | 24 (50.0) | 35 (34.0) | 0.157 |
Children < 18 living with them | 44 (17.6) | 1 (2.9) | 2 (10.5) | 9 (19.6) | 10 (20.8) | 22 (21.4) | 0.127 |
Less than high school/GED | 131 (52.4) | 18 (52.9) | 13 (68.4) | 20 (43.5) | 24 (50.0) | 56 (54.4) | 0.448 |
Homeless, past 3 months | 156 (62.4) | 24 (70.6) | 17 (89.5) | 38 (82.6) | 36 (75.0) | 41 (39.8) | < 0.001 |
Food insecurity, past 3 month | 135 (54.0) | 17 (50.0) | 12 (63.2) | 29 (63.0) | 29 (60.4) | 48 (46.6) | 0.245 |
Arrested, past 12 months | 116 (46.6) | 18 (52.9) | 9 (47.4) | 25 (54.3) | 25 (53.2) | 39 (37.9) | 0.227 |
Experienced childhood abuse | 126 (52.5) | 21 (63.6) | 9 (50.0) | 20 (45.5) | 23 (48.9) | 53 (54.1) | 0.575 |
Daily sex work | 165 (66.0) | 26 (76.5) | 11 (57.9) | 33 (71.7) | 35 (72.9) | 60 (58.3) | 0.154 |
30+ clients in past 3 months | 111 (44.8) | 11 (32.4) | 9 (47.4) | 21 (45.7) | 17 (35.4) | 53 (52.5) | 0.177 |
Ever find clients indoors | 120 (48.4) | 16 (47.1) | 9 (47.4) | 21 (46.7) | 24 (51.1) | 50 (48.5) | 0.994 |
Ever find clients online | 69 (27.8) | 14 (41.2) | 7 (36.8) | 14 (31.1) | 15 (31.9) | 19 (18.4) | 0.063 |
Ever find clients from referrals | 110 (44.4) | 11 (32.4) | 8 (42.1) | 24 (53.3) | 14 (29.8) | 53 (51.5) | 0.047 |
Time in street-based sex work | 0.065 | ||||||
 6+ years | 129 (51.6) | 16 (47.1) | 5 (26.3) | 21 (45.7) | 25 (52.1) | 62 (60.2) |  |
  ≤ 5 years | 121 (48.4) | 18 (52.9) | 14 (73.7) | 25 (54.3) | 23 (47.9) | 41 (39.8) |  |
Daily non-injection drug useb | 186 (74.4) | 28 (82.4) | 10 (52.6) | 36 (78.3) | 35 (72.9) | 77 (74.8) | 0.179 |
Daily injection drug use | 146 (58.4) | 28 (82.4) | 11 (57.9) | 26 (56.5) | 28 (58.3) | 53 (51.5) | 0.038 |