Table 1.
The chance of a sample mean to be within ±10% of the “Population Estimated” Mean was determined for various degrees of polymegethism corneas (data from Hirst et al 49).
| Chance of Recognizing a 10% Difference in a Sample Mean* from the “Population Estimated” ** mean using: | ||||
|---|---|---|---|---|
| Endothelial Cell Pattern (n = # patients) | 1 sample | 3 samples | 5 samples | 9 samples |
| Homogeneous (n=3) | 21.8% | 72.5% | 80.7% | 99.4% |
| Moderate Polymegethism (n=3) | 17.6% | 52.4% | 76.3% | 99.1% |
| Extreme Polymegethism (n=3) | 10.8% | 33.2% | 45.6% | 72.5% |
*
Sample Mean was derived from the mean of 40 samples of sets of 1, 3, 5, or 9 samples of 120 cells.
**
The “Population Estimated” mean is derived from approximately 3000 cells from a wide field specular micrograph.