TABLE 3. Distribution and prevalence of AP, ET and AP/ET by age group.

Age group	No. of Patients w/AP	No. of Teeth	Teeth w. AP (%)*	Teeth w. ET(%)*	Teeth w. AP/ET (%)**
20 - 29	11	509	19 (3.7%)	27 (5.3%)	13 (48.1%)
30 - 39	23	1033	50 (4.8%)	82 (7.9%)	42 (51.2%)
40 - 49	54	1994	114 (5.7%)	226 (11.3%)	90 (39.8%)
50 - 59	27	964	63 (6.5%)	124 (12.8%)	54 (43.5%)
≥ 60	20	508	50 (9.8%)	94 (18.5%)	36 (38.2%)
Total	135	5008	296 (5.9%)	553 (11.0%)	235 (42.5%)

^*percent values apply to the number of teeth examined

^**percent values apply to the number of endodontically treated teeth