Table 1.

Characteristics of Survey Participants and Nonparticipants

Characteristic	Nonparticipant	Participant	Total	p
n (%)	3905 (88.4)	513 (11.6)	4418 (100.0)
Age, median (interquartile interval)	50 (40; 61)	55 (44; 65)	50 (40; 62)	<0.01
Medical school graduation year, median (interquartile interval)	1996 (1983; 2007)	1990 (1979; 2004)	1995 (1983; 2007)	<0.01
SDCMS member, n (%)				0.02
No	987 (25.3)	105 (20.5)	1092 (24.7)
Yes	2918 (74.7)	408 (79.5)	3326 (75.3)
UCSD affiliation, n (%)				0.30
No	2959 (75.8)	378 (73.7)	3337 (75.5)
Yes	946 (24.2)	135 (26.3)	1081 (24.5)
Gender, n (%)				0.04
Male	2472 (63.3)	307 (59.8)	2779 (62.9)
Female	1287 (33.0)	194 (37.8)	1481 (33.5)
Undisclosed	146 (3.7)	12 (2.3)	158 (3.6)
Race/ethnicity, n (%)				<0.01
Caucasian	1235 (31.6)	210 (40.9)	1445 (32.7)
Latino/Hispanic	129 (3.3)	21 (4.1)	150 (3.4)
Black	23 (0.6)	1 (0.2)	24 (0.5)
Asian/Native American/Pacific Islander	305 (7.8)	34 (6.6)	339 (7.7)
Other	21 (0.5)	2 (0.4)	23 (0.5)
Undisclosed	2192 (56.1)	245 (47.8)	2437 (55.2)
Specialty groups, n (%)				0.04
Anesthesiology	296 (7.6)	37 (7.2)	333 (7.5)
Dermatology	82 (2.1)	8 (1.6)	90 (2.0)
Emergency Medicine	136 (3.5)	22 (4.3)	158 (3.6)
Family Medicine/General Practice	287 (7.3)	37 (7.2)	324 (7.3)
Internal Medicine	997 (25.5)	122 (23.8)	1119 (25.3)
Neurology	100 (2.6)	11 (2.1)	111 (2.5)
Obstetrics and Gynecology	171 (4.4)	28 (5.5)	199 (4.5)
Pathology	69 (1.8)	11 (2.1)	80 (1.8)
Pediatrics	259 (6.6)	50 (9.7)	309 (7.0)
Psychiatry	163 (4.2)	29 (5.7)	192 (4.3)
Radiology	203 (5.2)	28 (5.5)	231 (5.2)
Surgical specialties	606 (15.5)	71 (13.8)	677 (15.3)
Other	114 (2.9)	23 (4.5)	137 (3.1)
Undisclosed	422 (10.8)	36 (7.0)	458 (10.4)

SCDMS, San Diego County Medical Society; UCSD, University of California, San Diego.