{'fraction_non_alphanumeric': 0.01877346683354193, 'fraction_numerical': 0.007509386733416771, 'mean_word_length': 5.299212598425197, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
The Population Dynamics of Mental Disorders

This chapter concerns the natural history of mental disorders from onset of disorder throughout the remaining life course. Data are presented from population-based cohort studies in the United States and in Denmark. Mental disorders start before midlife and are persistent, with long episodes and recurrences for as many as a 20%–30% of those who meet criteria for the disorders. The cumulative incidence proportion is above 30%. Early identification of mental disorders via precursor signs and symptoms has the potential to contribute to prevention of full episodes. Comorbidity is common among mental disorders both for other mental disorders, and for later-occurring physical disorders. Most mental disorders are associated with raised mortality risk.