{'fraction_non_alphanumeric': 0.017241379310344827, 'fraction_numerical': 0.0049261083743842365, 'mean_word_length': 4.732394366197183, '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}}
Acute and Chronic Tocolysis

Preterm birth occurs in 12% of all births in the United States. Preterm labor precedes approximately half of these births. Tocolysis is used in the short term to prolong pregnancy long enough to administer corticosteroids and/or facilitate transfer to a tertiary care center. A number of agents have been used for this therapy, which will be discussed in the following chapter.