Machiel Naeije (A-2) studied the relationship between maximum mouth opening and measurements of the lower jaw (mandible). He measured the dependent variable, maximum mouth opening (MMO, measured in mm), as well as predictor variables, mandibular length (ML, measured in mm) and angle of rotation of the mandible (RA, measured in degrees) of 35 subjects.

MMO (Y) ML (X1) RA (X2) MMO (Y) ML (X1) RA (X2)

52.34 100.85 32.08 50.82 90.65 38.33 51.90 93.08 39.21 40.48 92.99 25.93 52.80 98.43 33.74 59.68 108.97 36.78 50.29 102.95 34.19 54.35 91.85 42.02 57.79 108.24 35.13 47.00 104.30 27.20 49.41 98.34 30.92 47.23 93.16 31.37 53.28 95.57 37.71 41.19 94.18 27.87 59.71 98.85 44.71 42.76 89.56 28.69 53.32 98.32 33.17 51.88 105.85 31.04 48.53 92.70 31.74 42.77 89.29 32.78 51.59 88.89 37.07 52.34 92.58 37.82 58.52 104.06 38.71 50.45 98.64 33.36 62.93 98.18 43.89 43.18 83.70 31.93 57.62 91.01 41.06 41.99 88.46 28.32 65.64 96.98 41.92 39.45 94.93 24.82 52.85 97.85 35.25 38.91 96.81 23.88 64.43 96.89 45.11 49.10 93.13 36.17 57.25 98.35 39.44 Source: Data provided courtesy of M. Naeije, D.D.S.