Pfirrmann classification | Grade I | Grade II | Grade III | Grade IV | Grade V | Total |
Lumbar discs | 6 | 18 | 25 | 32 | 15 | 96 |
MK map discs | 4 | 10 | 16 | 15 | 1 | 46 |
Detection rate (%) | 66.7 | 55.6 | 64 | 46.9 | 6.7 | 47.9 |