Table 2.
Estimated DFLE based on Sullivan’s method for selected ages of the 1999 U.S. population
| Age | Estimated disability prevalence |
Estimated DFLE |
nxmx known 95% CI |
nxmx estimated 95% CI |
||
|---|---|---|---|---|---|---|
| Lower | Upper | Lower | Upper | |||
| 20 | .01 | 54.47 | 54.40 | 54.53 | 54.37 | 54.56 |
| 25 | .00 | 49.73 | 49.67 | 49.79 | 49.64 | 49.82 |
| 30 | .00 | 44.98 | 44.91 | 45.04 | 44.89 | 45.07 |
| 35 | .00 | 40.25 | 40.19 | 40.32 | 40.16 | 40.34 |
| 40 | .01 | 35.59 | 35.53 | 35.66 | 35.51 | 35.68 |
| 45 | .01 | 31.02 | 30.96 | 31.09 | 30.94 | 31.10 |
| 50 | .01 | 26.58 | 26.52 | 26.64 | 26.50 | 26.66 |
| 55 | .02 | 22.26 | 22.19 | 22.32 | 22.18 | 22.34 |
| 60 | .01 | 18.17 | 18.11 | 18.24 | 18.10 | 18.25 |
| 65 | .03 | 14.31 | 14.24 | 14.37 | 14.24 | 14.38 |
| 70 | .05 | 10.70 | 10.64 | 10.77 | 10.64 | 10.77 |
| 75 | .08 | 7.30 | 7.24 | 7.37 | 7.24 | 7.37 |
| 80 | .15 | 4.05 | 3.99 | 4.11 | 3.99 | 4.11 |
| 85 | .20 | .77 | .75 | .78 | .74 | .79 |
NOTE: The first column shows the estimated disability prevalence using the sample (weighted) averages from the 1999 National Health Interview Survey and the 1999 National Nursing Home Survey. The definition of disability is based on activities of daily living. The remaining five columns present the point estimates of DFLE and their 95% confidence intervals using Sullivan’s method, without and with accounting for the sampling variability in the estimation of nxmx.