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Cumulative probability plots of spinal mobility (BASMI) and disease activity (ASDAS) versus FVC%. The probability plot of the BASMI scores (squared symbols) visualizes that patients with high BASMI scores (the curve bends steeply at approximately 20%) almost always had low FVC%, while most of the patients with low BASMI scores also had normal FVC%. The B plot shows that among the patients with very high ASDAS scores (approximately 15%), most had normal FVC%.
