Table 2.

Summary of heart sound recordings.

Database	Original number	Range of recording length (s)	Num. excluding those less than 6 s	Num. of very bad quality	Num. of bad quality	Num. of borderline quality	Num. of good quality	Num. of excellent quality
CinCHS	3153	5.3-121.9	3152	196	471	659	948	878
CTHS	412	17.9-71.1	412	0	135	149	62	66
PASCAL	859	0.7-27.8	454	52	24	124	139	115
CDHS	3875	15.0-34.1	3875	71	1557	948	801	498
Sum	8299	5.3-121.9	7893	319	2187	1880	1950	1557