Figure 4. . Tornado diagram representing the incremental cost-effectiveness ratios of one-way sensitivity analysis on vaccinating men and women compared to vaccinating women only. The vertical line represents the incremental cost-effectiveness ratio under base-case conditions. The sensitivity analysis range is displayed in parentheses next to each variable. Unequal penetration represents potential for lower (or higher) vaccine penetration in the highest risk groups, from 30% to 80% of target group, compared to 70% penetration in base case. QALY, quality-adjusted life-year.