{'fraction_non_alphanumeric': 0.026004728132387706, 'fraction_numerical': 0.004728132387706856, 'mean_word_length': 4.72972972972973, '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}}
Defining obesity hypoventilation syndrome

The definition of obesity hypoventilation syndrome (OHS) proposed by Hart et al 1 raises two questions that we have tried to answer briefly in this letter. 

First, previous definitions of OHS included obstructive sleep apnoea (OSA); Hart et al have excluded it. Why? OSA is present in most patients with OHS and is partly responsible for the hypercapnia.2 We believe that it is …