Table 2

Changes in sexual risk behaviour before and after joining a PrEP programme

ItemsPre-questionnairePost-questionnaireMcNemar test
P value
Sex in recent 12 months
 No33 (1.7%)101 (5.3%)<0.0001
 Yes1859 (98.3%)1791 (94.7%)
Condomless sexual behaviours in recent 12 months
 No1566 (82.8%)1462 (77.3%)<0.0001
 Yes326 (17.2%)430 (22.7%)
Number of regular sex partners in recent 3 months
 ≤11360 (71.9%)1388 (73.4%)0.231
 ≥2532 (28.1%)504 (26.6%)
Number of non-regular sex partners in recent 3 months
 ≤1677 (35.8%)881 (46.6%)<0.0001
 ≥21215 (64.2%)1011 (53.4%)
Narcotics usage in recent 12 months
 No1745 (92.2%)1783 (94.2%)<0.0001
 Yes*147 (7.8%)109 (5.8%)
  Amphetamine (both slam or inhalation)98 (55.4%)89 (50.3%)
  Amphetamine (inhalation only)95 (53.7%)80 (45.2%)
  MDMA35 (19.8%)27 (15.3%)
  Marijuana31 (17.5%)17 (9.6%)
  Amphetamine (slam only)19 (10.7%)28 (15.8%)
  GHB21 (11.9%)17 (9.6%)
  Ketamine11 (6.2%)5 (2.8%)
  LSD5 (2.8%)3 (1.7%)
  Erimine4 (2.3%)2 (1.1%)
  5-MeO4 (2.3%)1 (0.6%)
  Crack cocaine3 (1.7%)1 (0.6%)
  Heroin2 (1.1%)1 (0.6%)
  FM22 (1.1%)2 (1.1%)
  Mephedrone1 (0.6%)0 (0.0%)
  Others13 (7.3%)3 (1.7%)
Frequency of usage of narcotics in recent 3 months
 No30 (16.9%)68 (38.4%)0.003
 Yes*147 (83.1%)109 (61.6%)
  Once a month or less81 (45.8%)67 (37.9%)
  2–3 times a month38 (21.5%)26 (14.7%)
  At least once a week24 (13.6%)13 (7.3%)
  At least once a day4 (2.3%)3 (1.7%)
Chemsex
 No5 (6.3%)5 (6.3%)0.162
 Yes†74 (93.7%)74 (93.7%)
  ≤30%13 (16.5%)10 (12.7%)
  30~50%12 (15.2%)21 (26.6%)
  50~80%7 (8.9%)10 (12.7%)
  ≥80%18 (22.8%)15 (19.0%)
  Always24 (30.4%)18 (22.8%)
Usage of condoms when having chemsex
 No26 (33.3%)37 (47.4%)0.084
 Yes52 (66.7%)41 (52.6%)
  Seldom33 (42.3%)31 (39.7%)
  Usually14 (17.9%)7 (9.0%)
  Always5 (6.4%)3 (3.8%)
Under treatment in mental clinics
 No67 (84.8%)62 (78.5%)0.302
 Yes‡12 (15.2%)17 (21.5%)
  • *The average and median duration (the period between pre-questionnaire and post-questionnaire response) were 276 and 289 days, and the denominator was 177 for those who had claimed narcotics usage in recent 12 months in the pre-questionnaire or post-questionnaire response.

  • †The denominator was 79 for those who had claimed chemsex in the pre-questionnaire or post- questionnaire response.

  • ‡The denominator was 79 for those who had claimed usage of narcotics and under treatment in mental clinics in the pre-questionnaire or post-questionnaire response.

  • PrEP, pre-exposure prophylaxis.