Table 2.
The principal characteristics of the image perimeter (cm) evaluation
| Variable | Perimeter | |
|---|---|---|
| Sample size | 2285 | |
| Lowest value | 3·0782 | |
| Highest value | 42·3190 | |
| Arithmetic mean | 13·3093 | |
| 95% CI for the mean | 13·0089–13·6096 | |
| Median | 10·7831 | |
| 95% CI for the median | 10·5818–10·9692 | |
| Variance | 53·6118 | |
| SD | 7·3220 | |
| Relative SD | 0·5501 (55·01%) | |
| Standard error of the mean | 0·1532 | |
| Coefficient of skewness | 0·8493 (P < 0·0001) | |
| Coefficient of kurtosis | −0·4588(P = 0·0002) | |
| D’Agostino–Pearson test for normal distribution | Reject normality (P < 0·0001) | |
| Percentiles | 95% CI | |
| 2·5 | 3·8633 | 3·7204–4·0068 |
| 5 | 4·6015 | 4·3230–4·8793 |
| 10 | 5·3348 | 5·1885–5·6287 |
| 25 | 8·6522 | 8·5235–8·8032 |
| 75 | 19·2079 | 18·6458–20·0935 |
| 90 | 24·7566 | 24·3568–25·1546 |
| 95 | 28·3463 | 26·8934–28·6002 |
| 97·5 | 29·3094 | 29·0131–29·4735 |
CI, confidence interval.