Negative pressure wound therapy: Potential publication bias caused by lack of access to unpublished study results data

Table 5 Sources of conference abstracts and unpublished study information on 28 RCTs: databases, trial registers, and systematic reviews

No	Abstracts or other sources	Bibliographic databases		Trial registers		Systematic reviews
		MEDLINE, EMBASE or CINAHL	Cochrane Clinical Trials	CT.gov	NRR	Evans 2001 [83]	Samson 2004 [9]	Pham 2006 [68]	Fisher 2003 [84]; Higgins 2003 [85]; Costa 2005 [67]; OHTAC 2006 [10]
1	Vuerstaek [74]	-	+	-	-	-	+	-	-
2	No abstract*	-	-	-	-	-	-	-	-
3	Obdeijn [75]	-	+	-	-	-	+	-	-
4	Payne [76]	-	+	-	-	-	+	-	-
5	Moues [77]	-	+	-	-	-	+	-	-
6	Heath [78]	-	+	-	-	+	-	+	-
7	No abstract^†	-	-	-	-	-	-	-	-
8	No abstract^‡	-	-	-	-	-	-	-	-
9	Joseph [79]	-	+	-	-	-	-	-	-
10	Adams [26]	-	-	-	+	-	-	+	-
11	Fryer [27]	-	-	+	-	-	-	+	-
12	McCarthy [28]	-	-	-	+	-	-	+	-
13	Walker [29]	-	-	-	+	-	-	+	-
14	No abstract^§	-	-	-	-	-	-	-	-
15	No abstract^\|\|	-	-	-	-	-	+	-	-
16	Bayer [31]	-	+	-	-	-	+	-	-
17	Greer [33]	-	+	-	-	+	-	+	-
18	Orgill [34]	-	+	-	-	-	+	-	-
19	Stannard [35]	-	+	-	-	-	+	-	-
20	Armstrong [36]	-	+	-	-	-	+	-	-
21	McCarthy [37]	-	-	+	-	-	-	-	-
22	Molnar [38]	-	+	-	-	-	+	-	-
23	Niezgoda [39]	-	+	-	-	-	+	-	-
24	Stannard [40]	-	+	-	-	-	+	-	-
25	Stannard [41]	-	+	-	-	-	+	-	-
26	Foo [42]	-	+	-	-	-	+	-	-
27	Gupta [43]	-	+	-	-	-	-	-	-
28	Lantis [44]	-	+	-	-	-	+	-	-
		0	18	2	3	2	15	6	0

* No preceding abstract was identified concerning the full-text article by Llanos 2006 (Tables 7–9).
† No preceding abstract was identified, but information by the manufacturer KCI was provided concerning the full-text article by Eginton 2003 (Tables 7–9).
‡ No preceding abstract was identified, but information by the manufacturer KCI was provided concerning the full-text article by Wanner 2003 (Tables 7–9).
§No preceding abstract was identified, but information by the manufacturer KCI was provided concerning the full-text article by Ford 2002 (Tables 7–9).
|| No preceding abstract was identified, but information by the manufacturer KCI was provided concerning this discontinued study KCI ID VAC 2001–02.
CT.gov: ClinicalTrials.gov (United States); NRR: National Research Register (United Kingdom National Health System); RCT: randomised controlled trial

ISSN: 1471-2288