Table 1.

Characteristics of journal policies for ICMJE-member and ICMJE-affiliated journals

	ICMJE-member journals (n=14)	ICMJE-affiliated journals (n=489)
Type of data-sharing policy
Explicit	8 (57%)	145 (30%; 26% to 34%)
Not existing	1 (8%)	68 (14%; 11% to 17%)
ICMJE	5 (35%)	276 (56%; 52% to 61%)
Sanctions in non-compliance of data-sharing	2 (14%)	0
Trial registration demanded
Yes, with a specification that it must be prospective	7 (50%)	178 (37%; 32% to 41%)
Yes, without specification	3 (21%)	142 (29%; 25% to 33%)
Referring to ICMJE	3 (21%)	114 (23%; 20% to 27%)
No	1 (8%)	55 (11%; 9% to 14%)
Issue/year*	16 (12–51)	6 (4–12)
Impact factor 2017†	11.7 (2.7–35.6)	2.4 (1.5–4)

*Not found for two journals; indicated in median and IQR.

†Not found for 258 journals; indicated in median and IQR.

ICMJE, International Committee of Medical Journal Editors.