Table 5 Distribution of left mandibular 1st and 2nd premolars with respect to age
Classification | Left 1st PM | Left 2nd PM | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
AGE | p-value | AGE | p-value | |||||||||||
10–20 | 21–30 | 31–40 | 41–50 | 51–60 | 60+ |  | 10–20 | 21–30 | 31–40 | 41–50 | 51–60 | 60+ |  | |
1 PM 1 | 18 | 65 | 79 | 43 | 31 | 26 | 0.001* | 23 | 80 | 77 | 43 | 30 | 25 | 0.001* |
1 PM 1–2−1 | 1 | 8 | 7 | 2 | 0 | 0 |  | 0 | 0 | 1 | 1 | 0 | 0 |  |
1 PM 1–2 | 4 | 4 | 7 | 1 | 0 | 2 |  | 1 | 1 | 0 | 0 | 0 | 1 |  |
1 PM 1–2−1–2 | 0 | 0 | 1 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |
2 PM 1 B 1Â L 1 | 2 | 7 | 5 | 4 | 1 | 2 | Â | 0 | 0 | 1 | 0 | 0 | 0 | Â |
2 PM B 1Â L 1 | 1 | 2 | 0 | 0 | 0 | 0 | Â | 0 | 1 | 0 | 1 | 0 | 0 | Â |
3 PMMB 1 DB 1Â L 1 | Â | Â | Â | Â | Â | Â | Â | 0 | 2 | 1 | 0 | 0 | 0 | Â |
 C-Shaped canals |  |  |  |  |  |  |  | 0 | 1 | 2 | 0 | 0 | 0 |  |
Total | 26 | 86 | 99 | 50 | 32 | 30 | Â | 24 | 85 | 82 | 45 | 30 | 26 | Â |