Table 2. PSR in Each Screening Cycle.

Cycle	I	II	III	IV	Total
Screened in (A)	165	24	14	30	233
Screened out (B)	670	26	34	59	789
Total screened (C = A + B)	835	50	48	89	1,022
PSR (A/C)%	20	48	29	34	23

PSR: positive screening rate.