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. 2024 Sep 9;25:36. doi: 10.1186/s40510-024-00534-2

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))