Figure 1. Total National Health Expenditures 1965 to 1990, with Bandwidth Intervals¹.

¹The bandwidth intervals around the baseline projection scenario provide one indicator of variability. The standard error associated with annual percent increases in total national health expenditures for 1966-1981 (see Table A-12) was multiplied by a t-distribution value of 2.131 to derive the bandwidth intervals. The calculated bandwidth intervals are approximate and are used as a rough guide in assessing variability and uncertainty.