Table 1. Characteristics of the sample by examination status.

	Study Subjects		1995 JADA Survey
Characteristic	Value (s.d.)	(N)	Value (s.e.)	(N)
Demographic Characteristics
Mean Age	45.5 (8.3)	334	46.7 (0.3)	1705
Year Grad from Dental School	18.6 (8.6)	333	-	-
Female	9.3%	334	8.2%	2143
Office Location
Urban/Suburban	78.0%	259	-	-
Rural	22.0%	73	-	-
Time in Primary Practice
Weeks worked (do not include vacation)	48.0 (2.8)	333	47.9 (0.1)	1706
Hours per week spent in the practice	37.9 (8.0)	333	37.3 (0.2)	1706
Weekly hours spent treating patients	32.5 (6.9)	333	33.7 (0.2)	1706
Patients' Ages
14 years of age or younger	17.4 (12.3)	329	18.0	1307
15 to 64 years of age	62.3 (16.9)	329	62.3	1305
65 years of age or older	20.3 (13.6)	328	19.5	1307
Payment Mechanisms
Covered by private insurance.	61.5 (24.1)	328	61.1	1312
Covered by a public assistance program.	9.4 (23.6)	330	5.6	1315
Not covered by any insurance.	28.9 (19.1)	328	33.0	1308