Table 1.
Means and standard errors of the mean for the closing and opening speeds and ranges of movements for the upper lip, lower lip, and jaw at each age level
| Age | |||||
|---|---|---|---|---|---|
| 9 months | 12 months | 15 months | 18 months | 21 months | |
| Jaw | |||||
| N | 21 | 22 | 18 | 22 | 17 |
| Cl. Speed | 28.66 (1.63) | 32.59 (2.65) | 41.05 (3.92) | 39.02 (2.58) | 40.07 (2.81) |
| Op Speed | 25.46 (1.14) | 29.90 (3.17) | 36.64 (4.39) | 34.85 (2.66) | 36.41 (2.25) |
| R.O.M. | 5.99 (.38) | 5.87 (.45) | 6.64 (.58) | 6.20 (.34) | 6.47 (.35) |
| Lower Lip | |||||
| N | 20 | 20 | 15 | 12 | 11 |
| Cl Speed | 37.02 (2.93) | 52.39 (4.62) | 57.83 (6.37) | 76.97 (9.53) | 67.69 (8.24) |
| Op Speed | 36.30 (2.52) | 45.98 (4.81) | 52.16 (7.05) | 58.89 (8.91) | 52.28 (7.38) |
| R.O.M. | 7.74 (.61) | 8.73 (.71) | 8.75 (.71) | 11.07 (1.03) | 10.21 (.95) |
| Upper Lip | |||||
| N | 21 | 21 | 18 | 20 | 16 |
| Cl Speed | 12.53 (.77) | 12.40 (1.20) | 13.83 (.93) | 15.57 (1.45) | 15.56 (.94) |
| Op Speed | 15.39 (.96) | 13.65 (1.22) | 16.50 (1.15) | 18.07 (1.42) | 17.83 (1.16) |
| R.O.M. | 2.87 (.20) | 2.51 (.21) | 2.56 (.13) | 3.09 (.19) | 3.42 (.22) |