Table 2: Characteristics of the reviewed papers.

Study	Sample Size	Study Design	Age	Sex
[35]	216	119 patients class I, 62 patients class II division 1, 15 patients class II division 2, 20 patients class III	11.4 ± 1.2 years	96 males, 120 females
[36]	146	122 patients Class I, 26 patients Class II.1, 9 patients Class II.2, 19 Class III; 39 patients with cross-bite and 137 without cross-bite	12.4 ± 2.1 years	65 males and 81 females
[30]	20	10 children with myopic defects 10 children with normal vision	Mean age 9±8 months, between 7 and 13 years
[28]	13	Healthy subjects in habitual dental occlusion and stimulating ANS maintaining rest position	Mean age 27.1 ± 6.9 years	5 females, 8 males
[31]	20	10 subjects wearing eyeglasses, 10 without sight defects	Mean age 21.5 ± 1.23 years	12 females and 8 males
[27]	20	10 males with polysomnographic diagnoses of mild OSAS and 10 with AHI less than 5	Mean age of study group 43.62±4.64 years Mean age of control group 41.78±7.45	20 males
[26]	36	18 females with myogenous TMD 18 matched controls	Mean age 26.5±5.3 years	36 females
[29]	40	20 RDC / TMD patients 20 controls	Less than 30 years	40 females
[32]	40	20 air force pilots 20 civilian pilots	Mean age 35.15 ± 8.14 years in air force group Mean age 34.23 ± 9.13 years in civilian pilots group	40 males
[33]	100	50 symptomatic patients with bilateral TMJ disc displacement 50 asymptomatic patients with normal disc position	Study group: 13 men, 37 women; mean age, 28.84 ± 8.22 years Control group: 14 men, 36 women; mean age, 29.96 ± 5.04 years
[2]	120	60 presenting mandibular latero-deviation, 60 without functional mandibular laterodeviation	From 4 to 11 years (mean age 7 years)	Study group: 36 males, 24 females Control group: matching gender and age case control.
[34]	36	18 permit holders shooters, 18 controls		36 males
[1]	50	25 TMD patients 25 non-TMD control subjects	Average age in TMD group: 31 years Average age in control group: 28 years	50 females