Table 4. Incremental costs and benefits of screening strategies compared to no screening.

Screening strategies	Average cost per person (PPP(current international $))	Incremental cost (PPP(current international $))	Effectiveness/qualy	incremental effectiveness	Incremental cost-effectiveness ratio (PPP(current international $))	The state of each strategy
No screening	7,030.78		17.99			undominated
Screening every three years from the age of 50	7,085.80	55.01	18.01	0.02	2,675.20	undominated
Screening every two years from the age of 50	7,133.10	102.32	18.01	0.02	4,189.08	Ext. dominated
Screening every three years from the age of 40	7,192.20	161.42	18.03	0.03	4,612.59	undominated
Screening every two years from the age of 40	7,266.44	235.65	18.03	0.04	6,166.56	Ext. dominated
Annual screening from the age of 50	7,262.90	232.12	18.02	0.03	8,493.02	abs. dominated
Screening every three years from the age of 30	7,301.06	270.28	18.04	0.05	5,813.10	undominated
Screening every two years from the age of 30	7,442.80	412.02	18.04	0.05	7,712.71	undominated
Annual screening from the age of 40	7,489.57	458.79	18.03	0.04	10,965.49	abs. dominated
Annual screening from the age of 30	7,892.55	861.77	18.05	0.06	13,311.10	Undominated