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Table 1 Key parameters used in the model

From: The effects of free condom distribution on HIV and other sexually transmitted infections in men who have sex with men

Parameter

Point estimate

Uncertainty

Source

Condom use in PSVs after intervention

87.8%a

83.8, 91.0%

[11]

Percentage of MSM that used a condom that were influenced through the availability of free condoms at PSVs

49.4%a

43.9, 54.8%

[11]

Percentage of MSM that used a free condom from the condom distribution, and that reported they would not have used a condom if condoms were not freely available at PSVs

14.2%

9.4, 20.3%

[11]

Percentage of relationships with casual partners that involved anal intercourse formed at PSVs among men frequenting PSVs

59.6%a

56.5, 62.7%

[16]

Number of active MSM in the Netherlands

300,000

estimate

[33]

Percentage of active MSM, who met a casual partner at a PSV in the last year

17.1%a

15.5, 18.9%

[17]

Number of condoms distributed in 2013

371,952

exact

[34]

Condom wastage

15%

estimate

 

Mean annual number of casual partners among men frequenting PSVs

21.8a

1–200

[17]

Mean number of sexual acts per casual partner

2.20a

1–50

[16]

Percentage insertive anal intercourse per sexual act

63.3%a

59.2, 67.2%

[16]

Market share of CLub GUN condoms at the CLub GUN locations

79.3%

73.8, 84.0%

 

Condom effectiveness

70%

estimate

[35, 36]

Prevalence among casual partners met at a PSV

 HIV

36.2%a

29.9, 42.8%

[16]

 Hepatitis C

0.46%a

0.05, 2.11%

[16]

 Chlamydia

10.0%a

6.6, 14.5%

[16]

 Gonorrhoea

5.9%a

3.4, 9.7%

[16]

 Syphilis

1.8%a

0.6, 4.3%

[16]

Prevalence among casual partners met in general

 HIV

22.8%a

19.9, 26.0%

[16]

 Hepatitis C

0.40%a

0.11, 1.08%

[16]

 Chlamydia

9.6%a

7.6, 11.8%

[16]

 Gonorrhoea

6.1%a

4.5, 8.0%

[16]

 Syphilis

2.0%a

1.2, 3.2%

[16]

Per-act infectivity

 HIV

1.025%

estimate

[37]

 Hepatitis C

0.5%a

estimate

[38]

 Chlamydia

17%

estimate

[39]

 Gonorrhoea

50%

estimate

[40]

 Syphilis

30%

estimate

[41]

  1. PSV public sex venues, MSM men who have sex with men
  2. Uncertainty is given as 95%CI (beta distribution), except when given otherwise
  3. aAdditional analyses were done to come to the parameter values provided