Figure 4 presents an efficiency curve comparing strategies that differ by the age at which to end screening. Women are assumed to have been screened every 3 years prior to age 65. The age at which to end screening varies in 5-year increments from age 70 to age 90. The number of colposcopies per 1000 women varies from 590 to 790 along the x-axis. The number of life-years varies from 69,204 to 69,214 per 1000 women. Strategies are compared by ranking them in order of average number of colposcopies per 1000 women. Adjacent strategies are then compared using an incremental colposcopy per life-year ratio, which is calculated using the difference in colposcopies divided by the difference in life-years. The strategies on the curve are those that are not dominated. A strategy that is “dominated” is eliminated from consideration because it is associated with more colposcopies and less effectiveness or fewer colposcopies but a higher colposcopy per life-year ratio than an adjacent strategy.

Figure 4Efficiency Curve Comparing Strategies Differing By Age at Which to End Screening, Among Women Who Have Been Screened Every 3 Years Prior to Age 65 Years*

*Screening is assumed to begin at age 21 years. After age 65 years, screening is then varied by interval (q3 and q5) and age at which to end screening (70, 75, 80, 85, and 90 years). Strategies presented are those identified as efficient using colposcopies per (undiscounted) life-year.

From: Results

Cover of Screening for Cervical Cancer: A Decision Analysis for the U.S. Preventive Services Task Force
Screening for Cervical Cancer: A Decision Analysis for the U.S. Preventive Services Task Force [Internet].
Evidence Syntheses, No. 86s.
Kulasingam SL, Havrilesky L, Ghebre R, et al.

NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.