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Table 1 Sources for variables used in mathematical modelling

From: A cost-benefit/cost-effectiveness analysis of an unsanctioned supervised smoking facility in the Downtown Eastside of Vancouver, Canada

Variable

Value

Source

Rate of pipe sharing (s)

80.0%

Ivsins et al. [44]

Number of pipes in circulation (N)

90,000

VANDU [45], Mui [46]

Percentage of pipes not cleaned (d)

33.0%

Scheinmann et al. [47]

Number of sharing partners (m)

6.30

Gyarmathy and Neaigus [48]

Proportion of crack users who are HCV negative (I)

83.0%

Fischer et al. [49]

Proportion of crack users who are HCV positive (q)

17.0%

Fischer et al. [49]

Probability of HCV infection from single crack pipe (t)

2.00%

Fischer et al. [23], Gilbert et al. [50]