Table 3.

Overall screening performance of screening methods in the SBSP

Screening methods	No. of tests	No. of patients	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)
CBE	13906	57	61.4	51.5	0.5	99.7
US	9261	54	53.7	98.5	17.4	99.7
MAM	9238	55	67.3	98.1	17.9	99.8
US + MAM	9226	53	79.3	96.9	12.8	99.9
Screening modality a	9994	50	76.0	97.2	12.1	99.9
Real practice of the modality	13906	57	75.4	81.3	1.6	99.9

^a Among women following the Qibao screening modality strictly.

Abbreviations: CBE: clinical breast examination; US: ultrasonography; MAM: mammography.