Table 1.

Summary of the results of applying the PRISMA statement to the individual meta-analyses

PRISMA statement results
			Yes		Partial		No
Title	1	Title	221	(93%)	13	(5%)	2	(0%)
Abstract	2	Structured summary	82	(35%)	147	(62%)	7	(3%)
Introduction	3	Rationale	233	(98%)	3	(1%)	0	(0%)
Methods	4	Objectives	143	(60%)	90	(38%)	3	(1%)
	5	Protocol and registration	2	(1%)	35	(15%)	199	(84%)
	6	Eligibility criteria	209	(88%)	27	(11%)	0	(0%)
	7	Information sources	235	(99%)	1	(0%)	0	(0%)
	8	Search	59	(25%)	177	(75%)	0	(0%)
	9	Study selection	134	(57%)	30	(13%)	72	(30%)
	10	Data collection process	149	(63%)	16	(7%)	71	(30%)
	11	Data items	127	(54%)	64	(27%)	45	(19%)
	12	Risk of bias in individual studies	103	(43%)	79	(33%)	54	(23%)
	13	Summary measures	235	(99%)	0	(0%)	1	(0%)
	14	Synthesis of results	234	(99%)	2	(1%)	0	(0%)
	15	Risk of bias across studies	152	(64%)	30	(13%)	54	(23%)
	16	Additional analyses	101	(43%)	12	(5%)	123	(52%)
Results	17	Study selection	112	(47%)	91	(38%)	33	(14%)
	18	Study characteristics	132	(56%)	94	(40%)	10	(4%)
	19	Risk of bias within studies	76	(32%)	84	(36%)	76	(32%)
	20	Results of individual studies	162	(68%)	36	(15%)	39	(16%)
	21	Synthesis of results	235	(99%)	1	(0%)	0	(0%)
	22	Risk of bias across studies	136	(57%)	35	(15%)	65	(27%)
	23	Additional analyses	90	(38%)	24	(10%)	122	(51%)
Discussion	24	Summary of evidence	232	(98%)	4	(2%)	0	(0%)
	25	Limitations	139	(59%)	38	(16%)	59	(25%)
	26	Conclusions	232	(98%)	4	(2%)	0	(0%)
Funding	27	Funding	114	(48%)	0	(0%)	122	(51%)