Although utilized for more than 50 years, the term has since been dropped in favor of a more contemporary disease classification for periodontal disease.

Depending on the disease classification, the presentation of disease may be from birth, or much later into adult life.

Almost two million male and female deaths were analysed by age and major disease classifications.

However, in recent times, as more and more of the individual mutations that cause myotonia congenita are identified, these limited disease classifications are becoming less widely used.