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Carbson 曾调查299人的开口度,男性为44.8±9.4mm,女性为39.2±10.8mm。Agerbelg 于1974年检查20岁健康成人的开口度均值,男性为58.6mm(44mm～77mm),女性为53.3mm(42mm～75mm)。其还观察了70岁有牙
Carbson had investigated the opening of 299 people, 44.8 ± 9.4mm for men and 39.2 ± 10.8mm for women. Agerbelg examined mean openness of 20-year-old healthy adults in 1974 at 58.6mm (44mm-77mm) for men and 53.3mm (42mm-75mm) for women. It also observed 70-year-old teeth