Table 2 Patterns of SDU and perceptions related PrEP among GBMSM with experience of SDU in the past year
| Â | % / Mean (SD) |
|---|---|
Patterns of SDU | (n = 82) |
Types of psychoactive substance used during SDU in past year | |
 Ketamine | 1.2 |
 Methamphetamine | 31.7 |
 Cocaine | 1.2 |
 Cannabis | 8.5 |
 Ecstasy | 3.7 |
 Dormicum / Halcion / Erimin 5 / Hypnotic drugs (non-prescription) | 0.0 |
 Heroin | 0.0 |
 Cough suppressant (not for curing cough) | 1.2 |
 Amyl nitrite | 80.5 |
 GHB/GBL | 31.7 |
 5-methoxy-N, N-diisopropyltryptamine (Foxy) | 4.9 |
 Mephedrone | 0.0 |
Poly-use of psychoactive substances in lifetime | |
 No | 69.5 |
 Yes | 30.5 |
Time since the first episode of SDU | |
  < 1 year | 40.2 |
 1–2 years | 15.9 |
 3–5 years | 15.9 |
  > 5 years | 28.0 |
Frequency of SDU in the past year | |
 1 episode/month | 37.8 |
 1–2 episodes/month | 29.3 |
  ≥ 3 episodes/month | 32.9 |
Condomless anal intercourse during SDU in the past year | |
 No | 48.8 |
 Yes | 51.2 |
Drug cessation/rehabilitation services provided by governmental organizations | |
 No | 97.6 |
 Yes | 2.4 |
Drug cessation/rehabilitation services provided by non-governmental organizations | |
 No | 90.2 |
 Yes | 9.8 |
Details of the most recent episode of SDU | |
 Number of participants | |
  2 | 78.0 |
   ≥ 3 | 22.0 |
 Alcohol consumption | |
  No | 85.4 |
  Yes | 14.6 |
 Use of erectile dysfunction drugs | |
  No | 69.5 |
  Yes | 30.5 |
 Group sex | |
  No | 80.5 |
  Yes | 19.5 |
 Condomless anal intercourse | |
  No | 48.8 |
  Yes | 51.2 |
Perceptions related to PrEP (among participants with experience of SDU in the past year who were not on PrEP) | (n = 70) |
Willingness to take once-daily oral pill as PrEP in the next six months after being briefed some facts of PrEP | |
 No (definitely not/probably not/neutral) | 32.9 |
 Yes (probably will/definitely will) | 67.1 |
Willingness to pay (HK$ per month) for using once-daily oral pill as PrEP (among those with willingness to take PrEP in the next six months, n = 56) | |
  ≤ 300 | 24.2 |
 301–500 | 14.3 |
 501–1000 | 18.6 |
 1000–2000 | 21.4 |
 2001–4000 | 17.1 |
 4001–6000 | 2.9 |
 6001–8000 | 1.4 |
  > 8000 | 0.0 |
Perceptions related to PrEP based on the TPB | |
 Positive attitudes toward PrEP (% agree) | |
  PrEP can reduce your chance of HIV infection during SDU | 81.4 |
  PrEP would reduce your worry of HIV infection when having condomless sex during SDU | 64.3 |
  PrEP provides you more choice for HIV prevention | 84.3 |
Positive Attitude Scalea | 8.1 (1.3) |
 Negative attitudes toward PrEP (% agree) | |
  Psychoactive substances that are used during SDU would reduce the protective effect of PrEP | 17.1 |
  Psychoactive substances that are used during SDU would aggravate the side-effects of PrEP | 30.0 |
  Psychoactive substances that are used during SDU would make you forget to take PrEP | 28.6 |
  Daily use of PrEP would cause severe financial burden for you | 80.0 |
  You will be stigmatized by medical professionals when you are using PrEP-related services | 37.1 |
Negative Attitude Scaleb | 10.2 (2.2) |
 Perceived subjective norm related to PrEP | |
  People who are important to you will support you to use PrEP | |
   Disagree/neutral | 32.9 |
   Agree | 67.1 |
 Perceived behavioral control to use PrEP | |
  In general, you are confident in taking PrEP every day in the next six months | |
  Strongly disagree/disagree/neutral | 35.7 |
  Agree/strongly agree | 64.3 |