Table 6 Prediction accuracy of stepwise LRA formulas using reference sample and test sample in different age groups
Male | Female | Total | ||||
|---|---|---|---|---|---|---|
N | % | N | % | N | % | |
Accuracy on the sample of age group 18 to39 years used to develop model | ||||||
Teeth in both jaws | 47/50 | 94 | 44/50 | 88 | 91/100 | 91 |
Maxillary teeth | 44/50 | 88 | 41/50 | 82 | 85/100 | 85 |
Mandibular teeth | 34/50 | 68 | 39/50 | 78 | 73/100 | 73 |
Accuracy on the sample of age group 40 to 60 years used to develop model | ||||||
Teeth in both jaws | 43/50 | 86 | 42/50 | 84 | 85/100 | 85 |
Maxillary teeth | 42/50 | 84 | 42/50 | 84 | 84/100 | 84 |
Mandibular teeth | 39/50 | 78 | 44/50 | 88 | 83/100 | 83 |
Accuracy on the sample of overall age group 18 to 60 years used to develop model | ||||||
Teeth in Both jaws | 84/100 | 84 | 82/100 | 82 | 166/200 | 83 |
Maxillary teeth | 84/100 | 84 | 82/100 | 82 | 166/200 | 83 |
Mandibular teeth | 76/100 | 76 | 74/100 | 74 | 150/200 | 74 |
Accuracy of LRA formula when applied on test sample of age group 18 to 60 years | ||||||
Teeth in both jaws | 15/20 | 75 | 16/20 | 80 | 31/40 | 77.5 |
Maxillary teeth | 15/20 | 75 | 16/20 | 80 | 31/40 | 77.5 |
Mandibular teeth | 14/20 | 70 | 15/20 | 75 | 30/40 | 75 |