| 1 | A | B | C | D | E |
| --- | --- | --- | --- | --- | --- |
| 2 | cost-effectiveness ratios of screening strategies, varied by age and frequency from societal perspective |  |  |  |  |
| 3 | screening strategy | total cost | total quality-adjusted life-years (qalys) per 1,000 women | incremental cost per qaly | average cost per qaly relative to no screening |
| 4 |  | $ |  | $ |  |
| 5 | no screening | 1,387,948 | 14,059 | .. | base case |
| 6 | annual ages 40 to 69 | 6,668,051 | 14,094 | 216,828 | 150,938 |
| 7 | annual ages 40 to 74 | 6,943,065 | 14,095 | 262,828 | 154,187 |
| 8 | annual ages 50 to 69 | 3,970,099 | 14,082 | 159,858 | 114,778 |
| 9 | annual ages 50 to 74 | 3,970,099 | 14,083 | 226,278 | 120,521 |
| 10 | biennial ages 50 to 69 | 2,885,565 | 14,075 | 97,006 | 95,313 |
| 11 | biennial ages 50 to 74 | 3,083,486 | 14,076 | dominated | 100,912 |
| 12 | triennial ages 50 to 69 | 2,511,486 | 14,071 | 94,762 | 94,762 |
| 13 | triennial ages 50 to 74 | 2,652,005 | 14,072 | dominated | 99,670 |
| 14 | annual ages 40 to 49/ biennial ages 50 to 69 | 5,572,348 | 14,088 | dominated | 146,333 |
| 15 | annual ages 40 to 49/ biennial ages 50 to 74 | 5,767,102 | 14,089 | dominated | 146,951 |
| 16 | annual ages 40 to 49 | 4,156,667 | 14,073 | dominated | higher cost/worse outcome |

Question: for the cost-effectiveness analysis, which screening strategies for women had lower incremental ratios? strategies in which screening continued to age 74 or those aged 50 to 69?
Answer: annual ages 50 to 69

Question: which screening strategy has the lowest incremental ratio?
Answer: triennial ages 50 to 69