Table II.
Mean density of the five grades at each depth point of the optical axis at 90º.
| 0.5 mm | 1.0 mm | 1.5 mm | 2.0 mm | 2.5 mm | 3.0 mm | 3.5 mm | 4.0 mm | |||||||||
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| Grade | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD |
| 0 | 10.960 | 3.1226 | 13.397 | 4.1579 | 11.457 | 3.4342 | 10.146 | 2.8129 | 9.320 | 2.3337 | 8.526 | 2.0535 | 7.809 | 1.7255 | 6.509 | 3.4418 |
| 1 | 13.878 | 9.8328 | 16.451 | 6.4321 | 13.482 | 4.0230 | 12.278 | 3.3263 | 10.827 | 2.7978 | 9.221 | 2.2743 | 7.604 | 1.9366 | 5.886 | 1.7248 |
| 2 | 13.399 | 6.8027 | 18.642 | 5.3914 | 15.696 | 4.0446 | 14.224 | 3.6382 | 12.343 | 3.2979 | 10.376 | 3.0379 | 8.079 | 2.2737 | 6.413 | 1.9247 |
| 3 | 14.148 | 10.3247 | 22.246 | 9.5370 | 22.961 | 8.6140 | 19.763 | 7.4675 | 14.325 | 5.5429 | 10.029 | 3.6553 | 7.056 | 2.2554 | 5.328 | 1.3853 |
| 4 | 31.848 | 22.6109 | 35.513 | 22.0768 | 28.396 | 15.3646 | 19.774 | 17.4216 | 11.535 | 7.4943 | 8.626 | 5.2924 | 6.526 | 3.8077 | 5.391 | 2.9915 |
SD, standard deviation.