Table 1.

Included studies and publications by category and study type

Source: Own table

Category	Study type	Included publications
		Number of studies or data sources	Number of publications	References
Total		43	68 plus Erratum	[14, 16, 55–121]
I Primary data analysis
Total		25	44	[14, 16, 55–97]
A		6	16	[16, 55–69]
B		2	5	[70–74]
C		3	3 plus Erratum	[75–78]
D		1	2	[79, 80]
E		4	5	[81–85]
F		9	13	[14, 86–97]
II Routine data analysis
Total		18	24	[98–121]