Table 6.

Sensitivity analyses on incremental cost effectiveness of policy of tight control of blood pressure compared with less tight control based on likely pattern of standard practice. Means (95% confidence intervals) calculated with Fieller’s method, all costs and health effects discounted at 6%, costs based on 1997 values

Cost and outcome measure	Mean (95% CI)
Time free from diabetes related end points:
Increased No of visits for tight control	2164 (−3638 to 55 051)
Increased No of visits for less tight control	396 (−11 933 to 21 358)
Life years gained*:
Increased No of visits for tight control	1486
Increased No of visits for less tight control	272

^*Estimated life years gained from tight control were not significant at 5% level (see table 4), hence 95% confidence intervals cannot be defined.