{'fraction_non_alphanumeric': 0.030943396226415093, 'fraction_numerical': 0.03471698113207547, 'mean_word_length': 4.740259740259741, '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}}
Performance data of screening mammography at a dedicated breast health centre.

BACKGROUND
Mammographic screening has become part of routine health care. We present a first analysis of screening mammography in a dedicated breast health centre in Africa.


OBJECTIVE
To establish a performance benchmark and provide data for health care policy and funding decisions on screening mammography.


METHOD
All mammography performed between January 2003 and August 2008 was entered into a prospective database. Mammography was performed exclusively by certified mammographers and double-read by experienced readers.


RESULTS
Outcomes were classified in a simplified classification system based on the Breast Imaging Reporting and Data System (BIRADS). In 40 - 49-year-old women, 3 192 mammograms led to a recall rate of 4.7%, a biopsy rate of 1.9% and a cancer diagnosis rate of 3.8 per 1 000 examinations; for women of 50 years and older, the corresponding figures were 4 446, 5.4%, 2.6% and 9.7 per 1 000. Of the cancers detected, 31% were in situ and, of the invasive cancers, 81% were node-negative. These figures were established by a dedicated surgeon-led team and fall within the range expected in organised screening programmes in resource-rich environments, providing a first benchmark for screening mammography in Africa.