Machiel Naeije (A-7) identifies variables useful in predicting maximum mouth opening (MMO, millimeters) for 35 healthy volunteers. The variables examined were:

AGE: years DOWN_CON: downward condylar translation, mm FORW_CON: forward condylar translation, mm Gender: 0 ¼ Female, 1 ¼ Male MAN_LENG: mandibular length, mm MAN_WIDT: mandibular width, mm Use the following reported measurements to perform a stepwise regression.

AGE DOWN_CON FORW_CON GENDER MAN_LENG MAN_WIDT MMO 21.00 4.39 14.18 1 100.86 121.00 52.34 26.00 1.39 20.23 0 93.08 118.29 51.90 30.00 2.42 13.45 1 98.43 130.56 52.80 28.00
.18 19.66 1 102.95 125.34 50.29 21.00 4.10 22.71 1 108.24 125.19 57.79 20.00 4.49 13.94 0 98.34 113.84 49.41 21.00 2.07 19.35 0 95.57 115.41 53.28 19.00
.77 25.65 1 98.86 118.30 59.71 24.00 7.88 18.51 1 98.32 119.20 53.32 18.00 6.06 21.72 0 92.70 111.21 48.53 22.00 9.37 23.21 0 88.89 119.07 51.59 21.00 3.77 23.02 1 104.06 127.34 58.52 20.00 1.10 19.59 0 98.18 111.24 62.93 22.00 2.52 16.64 0 91.01 113.81 57.62 24.00 5.99 17.38 1 96.98 114.94 65.64 22.00 5.28 22.57 0 97.86 111.58 52.85 22.00 1.25 20.89 0 96.89 115.16 64.43 22.00 6.02 20.38 1 98.35 122.52 57.25 19.00 1.59 21.63 0 90.65 118.71 50.82 26.00 6.05 10.59 0 92.99 119.10 40.48 22.00
1.51 20.03 1 108.97 129.00 59.68 24.00
.41 24.55 0 91.85 100.77 54.35 21.00 6.75 14.67 1 104.30 127.15 47.00 22.00 4.87 17.91 1 93.16 123.10 47.23 22.00 .64 17.60 1 94.18 113.86 41.19 29.00 7.18 15.19 0 89.56 110.56 42.76 25.00 6.57 17.25 1 105.85 140.03 51.88 20.00 1.51 18.01 0 89.29 121.70 42.77 27.00 4.64 19.36 0 92.58 128.01 52.34 26.00 3.58 16.57 1 98.64 129.00 50.45 23.00 6.64 12.47 0 83.70 130.98 43.18 25.00 7.61 18.52 0 88.46 124.97 41.99 22.00 5.39 11.66 1 94.93 129.99 39.45 31.00 5.47 12.85 1 96.81 132.97 38.91 23.00 2.60 19.29 0 93.13 121.03 49.10