Table 1.

PES prevalence in 3 different municipalities in Sør-Trøndelag county, Norway. Examination was performed in 1985–86, and 1888 of 2109 persons above 64 years of age were examined.

Age groups (years)	PES-negative	PES-positive	Total
65–69	447 (89.0%)	55 (11.0%)	502 (100%)
70–74	482 (87.2%)	71 (12.8%)	553 (100%)
75–79	337 (81.6%)	76 (18.4%)	413 (100%)
80–84	193 (76.0%)	61 (24.0%)	254 (100%)
85–89	81 (68.6%)	37 (31.4%)	118 (100%)
90–98	29 (60.4%)	19 (39.6%)	48 (100%)
Total	1569 (83.1%)	319 (16.9%)	1888 (100%)