Table 4.
Descriptive statistics for the width and thickness of the masseter muscle per vertical group
| Outcomes | Norm | Hypo | Hyper | |||
|---|---|---|---|---|---|---|
| N, n (min–max) | Pooled mean (95% CI); I2 | N, n (min–max) | Pooled mean (95% CI); I2 | N, n (min–max) | Pooled mean (95% CI); I2 | |
| All patients | ||||||
| Masseter thickness (mm) | 9; 202 [4–55] | 11.6 (10.4–12.7); I2 = 0.98 | 9; 152 [10–28] | 12.9 (11.6–14.1); I2 = 0.98 | 9; 165 [5–32] | 10.5 (9.1–12.0); I2 = 0.98 |
| Masseter width (mm) | 2; 24 [4–20] | 41.6 (33.5–49.7); I2 = 0.79 | 1; 20 [20–20] | 46.0 (44.2–47.7) | 2; 25 [5–20] | 39.3 (36.8–41.7); I2 = 0.3 |
| Masseter thickness _bite (mm) | 7; 183 [10–55] | 12.9 (11.6–14.2); I2 = 0.97 | 8; 137 [10–28] | 14.7 (13.4–15.9); I2 = 0.97 | 8; 160 [10–32] | 12.2 (10.8–13.7); I2 = 0.98 |
| Masseter width _bite (mm) | 1; 20 [20–20] | 40.0 (38.2–41.7) | 1; 20 [20–20] | 42.0 (40.7–43.3) | 1; 20 [20–20] | 37.0 (35.7–38.3) |
| Males | ||||||
| Masseter thickness (mm) | 4; 50 [6–26] | 13.2 (11.7–14.6); I2 = 0.84 | 4; 38 [4–17] | 14.7 (14.0–15.3); I2 = 0.39 | 4; 38 [8–11] | 12.2 (9.9–14.5); I2 = 0.94 |
| Masseter width (mm) | 0; 0 | 0; 0 | 0; 0 | |||
| Masseter thickness _bite (mm) | 4; 50 [6–26] | 14.7 (13.7–15.7); I2 = 0.63 | 4; 38 [4–17] | 16.1 (15.6–16.7); I2 = 0 | 4; 38 [8–11] | 13.7 (11.2–16.3); I2 = 0.95 |
| Masseter width _bite | 0; 0 | 0; 0 | 0; 0 | |||
| Females | ||||||
| Masseter thickness (mm) | 4; 66 [8–29] | 12.1 (11.7–12.6); I2 = 0 | 4; 35 [7–11] | 12.8 (11.6–13.9); I2 = 0.72 | 4; 61 [8–24] | 11.5 (10.5–12.5); I2 = 0.71 |
| Masseter width (mm) | 0; 0 | 0; 0 | 0; 0 | |||
| Masseter thickness _bite (mm) | 4; 66 [8–29] | 13.5 (13.0–13.9); I2 = 0 | 4; 35 [7–11] | 14.5 (14.1–15.0); I2 = 0.4 | 4; 61 [8–24] | 12.9 (12.1–13.7); I2 = 0.62 |
| Masseter width _bite (mm) | 0; 0 | 0; 0 | 0; 0 | |||
N: number of studies reporting the outcome in more than 1 patient; n: total number of patients in the studies; min–max: number of patients in the smallest and the largest study; I2: statistic for assessing the between-study heterogeneity (from 0 (no heterogeneity) to 1 (extreme heterogeneity))