Epidemiology
Pseudohypoparathyroidism (PHP) is extremely rare. One study collected data from randomly selected departments of pediatrics, internal medicine, neurology, and endocrinology throughout Japan. A total of 203 patients were diagnosed with PHP in 1997, providing an estimated prevalence of 0.34 cases of PHP per 100,000 inhabitants in Japan. These numbers are likely to be an underestimate given the wide range of presentations of PHP.[9] One 2011 National Patient Registry review in Denmark identified 60 patients, a prevalence of 1.1 cases per 100,000 inhabitants.[10] Based on expert opinion, type Ia is the most common form. The ratio of women to men is approximately 2:1.[9][10]
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