Table 1.

General characteristics of the included studies

	Medical writing support (n=110)	No medical writing support (n=123)
Number of journals that articles were published in	44	57
Number of authors, median (IQR)	7 (5–9)	6 (4–8)
Articles published on behalf of a study group	12 (10.9%)	4 (3.3%)
Number of patients randomised to study, median (IQR)	159 (65.75–407.75)	43 (21–82)
Year of publication
2001–2004	0	17 (13.8%)
2005–2007	12 (10.9%)	25 (20.3%)
2008–2010	31 (28.2%)	34 (27.6%)
2011–2014	67 (60.9%)	47 (38.2%)
Funding source
Industry	108 (98.2%)	39 (31.7%)
Part-industry	2 (1.8%)	23 (18.7%)
Non-industry	0	61 (49.6%)