Table 4.
Helix and strand occurrence in different structural classes
| Conserved | Random | Prediction interval * | Difference | Number of prediction intervals** | |
| Strands | |||||
| Alpha/beta | 2217 | 1984.4 | 109.2 | -232.6 | 2.13 |
| Alpha + beta | 1556 | 1465.3 | 83.3 | -90.7 | 1.09 |
| All alpha | 263 | 343.7 | 63.3 | 80.7 | 1.27 |
| All beta | 1666 | 1427.7 | 70.1 | -238.3 | 3.40 |
| Helices | |||||
| Alpha/beta | 2127 | 2262.4 | 84.5 | 135.4 | 1.60 |
| Alpha + beta | 1109 | 1229.2 | 62.7 | 120.2 | 1.92 |
| All alpha | 1139 | 1104.2 | 37.3 | -34.8 | 0.93 |
| All beta | 326 | 466.43 | 47.4 | 140.4 | 2.97 |
* Prediction interval was created by the standard deviation of the random sets multiplied by the t value for 21 degrees of freedom.
** The number of prediction intervals that differentiates between conserved regions and the average of random regions. In lines highlighted by bold print the difference was significant with a confidence of at least 95%.