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. 2022 Mar 1;18(3):843–850. doi: 10.5664/jcsm.9734

Table 2.

TCM scoring system.12

Coefficient Score
1 2 3 4
Tonsil size 2.7 Grade 4 Grade 3 Grade 2 Grade 1
CT90 (%) 2.2 < 10 10–20 20–40 ≥ 40
MH (mm) 1.6 < 10 10–15 15–20 ≥ 20

CT90 = percentage of time with oxygen saturation below 90%, MH = vertical distance between the lower edge of the mandible and the lower edge of the hyoid.