Table III.
Injection initiation and frequency among male IDU participants in Seattle-area NHBS IDU and MSM surveys, 2008–2012
| IDU | Amphet.-injecting MSM/IDU | Other MSM/IDU | Amphet.-injecting MSM/IDU vs. | |||||
|---|---|---|---|---|---|---|---|---|
|
| ||||||||
| IDU | Other MSM/IDU | |||||||
| Age first injected | n/N | % | n/N | % | n/N | % |
|
|
| ≤ 15 | 112/646 | 17% | 5/79 | 6% | 15/63 | 24% | ||
| 16 – 20 | 220/646 | 34% | 14/79 | 18% | 15/63 | 24% | p=5·10−9 | p=4·10−5 |
| 21 – 25 | 141/646 | 22% | 11/79 | 14% | 18/63 | 29% | ||
| 26 + | 173/646 | 27% | 49/79 | 62% | 15/63 | 24% | ||
|
| ||||||||
| Injection frequency | ||||||||
| > 1/day | 396/634 | 63% | 18/78 | 23% | 34/59 | 58% | p=5·10−12 | p=2·10−4 |
| 1/week – 1/day | 155/634 | 24% | 30/78 | 39% | 12/59 | 20% | ||
| < 1/week | 83/634 | 13% | 30/78 | 39% | 13/59 | 22% | ||