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Table 2 Behavioural, epidemiological, and cost parameters: Base case values and ranges

From: The cost-effectiveness of the WINGS intervention: a program to prevent HIV and sexually transmitted diseases among high-risk urban women

Parameter Base case value Range Source
Condom use, without participation in intervention (ρb) 53.2% - Greenberg et al [10], as described in appendix
Condom use, with participation in full intervention (ρi) 57.7% 55.45% – 59.95% Greenberg et al [10], as described in appendix
Condom use, with participation in condom use skills component of intervention (ρi) 56.8% 55% – 58.6% Greenberg et al [10], as described in appendix
Annual probability of HIV infection without participation in intervention (P) 0.019 0.0095 – 0.029 Various (see text)
Condom effectiveness (ε) 95% 85% – 98% Pinkerton and Abramson [25]
Number of women in intervention (N) 266 - Greenberg et al (2000) [10]
Duration of intervention effect in months (D) 6 3 – 9 Greenberg et al (2000) [10]
Societal cost per case of HIV (includes direct medical care costs, lost economic productivity and other indirect costs) $337,000 $169,000 – $506,000 Holtgrave and Pinkerton [27] and Mullins et al [28], as described in text
Direct medical care costs per case of HIV $195,000 $98,000 – $293,000 Holtgrave and Pinkerton [27]
Number of QALYs saved per HIV infection averted 11.23 9.34 – 13.18 Holtgrave and Pinkerton [27]
  1. Note: Costs are expressed in 1996 US$.