Table 1.
Sample Size by Algorithm
| Total Sample Size | Number of Cases | |||||
|---|---|---|---|---|---|---|
| Data Year | Nattinger | Warren | Freeman | Nattinger | Warren | Freeman |
| 1995 | 71,839 | 73,995 | 73,995 | 8,391 | 8,746 | 8,746 |
| 1996 | 70,202 | 72,422 | 72,422 | 8,197 | 8,561 | 8,561 |
| 1997 | 67,854 | 70,346 | 70,346 | 8,397 | 8,785 | 8,785 |
| 1998 | 66,183 | 68,220 | 68,220 | 8,335 | 8,699 | 8,699 |
| Reported sample size | 132,584 | 659,260 | 47,560 | 7,700 | 3,230 | 3,339 |
Note: Sampling criteria are the same for the Warren and Freeman algorithms, thereby yielding the same sample size for analyses of both.