Fig. 3From: Prevalence of an incompetent lip seal during growth periods throughout Japan: a large-scale, survey-based, cross-sectional studyThe age-dependent rate of incompetent lip seal (ILS) in Japanese children (%). An incompetent lip seal was defined as an answer of “yes” or “think so” to question item 18—“Is your child’s mouth often open during the day?”Back to article page