Table 1

 Comparison of characteristics of survey respondents and non-respondents

Respondents (n=317)Non-respondents (n=366)P value
Corresponding author characteristic
Primary employer:
 Medical school or hospital278 (88)319 (87)0.72
 Government19 (6)18 (5)
 Private industry4 (1)8 (2)
 Other16 (5)21 (6)
Location:
 US or Canada167 (53)172 (47)0.11
 Western Europe113 (36)159 (43)
 Other37 (12)35 (10)
Clinical trial characteristic
Funding agency:
 Government120 (38)87 (24)0.001
 Private industry71 (22)107 (29)
 Non-profit organisation or other45 (14)54 (15)
 Mixed (two or more funders)81 (26)118 (32)
Median (interquartile range) enrolment size524 (234–1700)502 (185–1585)0.17
Journal where trial was published:
New England Journal of Medicine 113 (36)137 (37)0.30
Lancet 70 (22)98 (27)
BMJ 53 (17)51 (14)
JAMA 43 (14)51 (14)
Annals of Internal Medicine 24 (8)21 (6)
PLoS Medicine 14 (4)8 (2)