Table 1.

Characteristics of respondents and nonrespondents^*

Characteristic	Respondents (n = 32)	Nonrespondents (n = 32)	P
Mean age (range), yr	45.3 (33-71)	44.6 (31-55)	0.53
Male sex, no. (%)	24 (75)	22 (69)	0.58
Specialty, no. (%)			0.78
Internal medicine	22 (69)	23 (72)
Psychiatry	3 (9)	4 (13)
Family medicine	1 (3)	1 (3)
Pediatrics	0	2 (6)
Behavioral science	6 (19)	2 (6)

^*Respondents were compared with nonrespondents using Student's t test for means and χ² for categoric data. A 2-tailed P < 0.05 was considered significant.