Table 3.

Journal impact factor and reported informed consent type in COVID-19 studies

Impact factor	0–5		5–10		>10		Data not available
Total, n	669		220		54		29
	n	%	n	%	n	%	n	%
Informed consent	148	22.1	43	19.5	11	20.4	5	17.2
Deferred consent	2	0.3	0	0.0	0	0.0	0	0.0
Verbal consent	21	3.1	11	5.0	3	5.6	0	0.0
Waiver of consent	273	40.8	103	46.8	24	44.4	14	48.3
Opt-out	6	0.9	1	0.5	0	0.0	1	3.4
Other consent types	0	0.0	1	0.5	0	0.0	0	0.0
No consent reported	219	32.7	61	27.7	16	29.6	9	31.0

Data are numbers (n) and percentages (%).

We observed only one ‘other consent type’ that was not predefined, which was family consent.