Assessing allocation concealment and blinding in randomised controlled trials: why bother?

Kenneth F Schulz

doi:10.1136/ebm.5.2.36

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Assessing allocation concealment and blinding in randomised controlled trials: why bother?

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Online download statistics by month: April 2001 to March 2024

	Abstract	Full	Pdf
Apr 2001	0	3	5
May 2001	0	9	5
Jun 2001	0	28	10
Jul 2001	0	27	19
Aug 2001	0	7	4
Sep 2001	0	5	2
Oct 2001	0	8	0
Nov 2001	0	13	0
Dec 2001	0	5	0
Jan 2002	0	9	0
Feb 2002	0	16	1
Mar 2002	0	9	4
Apr 2002	0	16	4
May 2002	0	4	0
Jun 2002	0	6	0
Jul 2002	0	6	0
Aug 2002	0	6	0
Sep 2002	0	6	2
Oct 2002	0	9	4
Nov 2002	0	7	0
Dec 2002	0	5	0
Jan 2003	0	3	0
Feb 2003	0	9	5
Mar 2003	0	6	1
Apr 2003	0	8	4
May 2003	0	1	0
Jun 2003	0	5	4
Jul 2003	0	109	2
Aug 2003	0	15	3
Sep 2003	0	10	0
Oct 2003	0	136	0
Nov 2003	0	37	6
Dec 2003	0	13	4
Jan 2004	0	19	6
Feb 2004	0	8	1
Mar 2004	0	15	5
Apr 2004	0	10	1
May 2004	0	21	7
Jun 2004	0	38	7
Jul 2004	0	23	4
Aug 2004	0	47	5
Sep 2004	0	49	12
Oct 2004	16	51	11
Nov 2004	12	51	12
Dec 2004	9	50	15
Jan 2005	7	55	16
Feb 2005	9	36	12
Mar 2005	10	34	7
Apr 2005	6	55	14
May 2005	5	38	8
Jun 2005	6	35	10
Jul 2005	2	26	9
Aug 2005	4	34	15
Sep 2005	2	46	14
Oct 2005	2	68	13
Nov 2005	3	72	22
Dec 2005	5	70	23
Jan 2006	6	85	17
Feb 2006	1	61	11
Mar 2006	17	71	26
Apr 2006	4	68	22
May 2006	4	64	13
Jun 2006	0	47	10
Jul 2006	3	66	14
Aug 2006	3	51	16
Sep 2006	0	90	27
Oct 2006	0	105	30
Nov 2006	0	124	32
Dec 2006	1	82	14
Jan 2007	0	149	28
Feb 2007	3	53	16
Mar 2007	3	104	43
Apr 2007	34	47	21
May 2007	30	43	23
Jun 2007	28	62	24
Jul 2007	11	53	25
Aug 2007	29	34	10
Sep 2007	42	38	8
Oct 2007	43	55	16
Nov 2007	40	54	21
Dec 2007	25	55	12
Jan 2008	44	63	21
Feb 2008	44	57	16
Mar 2008	44	66	20
Apr 2008	39	58	18
May 2008	23	46	13
Jun 2008	33	32	17
Jul 2008	42	31	17
Aug 2008	42	29	9
Sep 2008	51	36	20
Oct 2008	56	23	11
Nov 2008	86	40	16
Dec 2008	54	36	11
Jan 2009	53	32	7
Feb 2009	50	40	11
Mar 2009	109	47	23
Apr 2009	81	50	18
May 2009	71	56	26
Jun 2009	60	29	13
Jul 2009	49	30	16
Aug 2009	58	32	14
Sep 2009	61	41	17
Oct 2009	71	42	17
Nov 2009	95	56	38
Dec 2009	73	42	8
Jan 2010	65	70	21
Feb 2010	72	43	12
Mar 2010	143	63	26
Apr 2010	115	75	27
May 2010	121	62	28
Jun 2010	68	47	25
Jul 2010	59	42	25
Aug 2010	88	38	12
Sep 2010	67	51	14
Oct 2010	147	75	17
Nov 2010	123	54	21
Dec 2010	109	52	16
Jan 2011	98	65	27
Feb 2011	107	43	11
Mar 2011	132	54	15
Apr 2011	127	59	16
May 2011	159	48	11
Jun 2011	135	32	10
Jul 2011	128	36	6
Aug 2011	136	37	15
Sep 2011	214	43	15
Oct 2011	144	59	16
Nov 2011	85	99	18
Dec 2011	16	189	30
Jan 2012	25	222	26
Feb 2012	22	223	24
Mar 2012	17	273	53
Apr 2012	16	223	37
May 2012	29	216	48
Jun 2012	17	177	32
Jul 2012	51	198	33
Aug 2012	26	313	44
Sep 2012	31	284	32
Oct 2012	27	304	25
Nov 2012	0	388	49
Dec 2012	0	264	33
Jan 2013	0	265	46
Feb 2013	0	325	52
Mar 2013	0	328	49
Apr 2013	0	262	26
May 2013	0	220	37
Jun 2013	6	114	9
Jul 2013	2	203	25
Aug 2013	7	148	25
Sep 2013	6	136	9
Oct 2013	0	101	12
Nov 2013	2	162	16
Dec 2013	2	162	14
Jan 2014	5	213	26
Feb 2014	7	195	29
Mar 2014	16	134	22
Apr 2014	6	179	20
May 2014	16	186	25
Jun 2014	27	190	22
Jul 2014	7	146	11
Aug 2014	4	138	5
Sep 2014	8	195	18
Oct 2014	3	212	11
Nov 2014	7	128	7
Dec 2014	6	150	19
Jan 2015	2	240	28
Feb 2015	6	163	22
Mar 2015	8	178	13
Apr 2015	4	272	25
May 2015	3	239	14
Jun 2015	7	160	17
Jul 2015	2	95	9
Aug 2015	0	124	8
Sep 2015	3	102	8
Oct 2015	3	162	10
Nov 2015	6	137	11
Dec 2015	6	135	11
Jan 2016	1	253	34
Feb 2016	8	175	17
Mar 2016	23	146	51
Apr 2016	12	252	20
May 2016	11	218	26
Jun 2016	6	143	13
Jul 2016	6	123	14
Aug 2016	3	121	16
Sep 2016	2	117	14
Oct 2016	3	176	16
Nov 2016	1	161	15
Dec 2016	7	134	21
Jan 2017	19	267	33
Feb 2017	3	188	23
Mar 2017	0	102	26
Apr 2017	1	114	16
May 2017	0	140	10
Jun 2017	17	85	11
Jul 2017	52	51	7
Aug 2017	67	63	19
Sep 2017	95	95	23
Oct 2017	106	102	22
Nov 2017	186	184	31
Dec 2017	172	160	37
Jan 2018	155	155	4
Feb 2018	125	118	19
Mar 2018	74	76	17
Apr 2018	150	142	17
May 2018	135	133	11
Jun 2018	99	99	6
Jul 2018	70	68	5
Aug 2018	91	89	5
Sep 2018	58	58	14
Oct 2018	116	116	26
Nov 2018	166	166	23
Dec 2018	154	154	26
Jan 2019	153	152	14
Feb 2019	135	135	15
Mar 2019	141	141	24
Apr 2019	100	100	18
May 2019	105	103	13
Jun 2019	46	46	7
Jul 2019	71	70	15
Aug 2019	64	64	19
Sep 2019	57	57	16
Oct 2019	78	76	25
Nov 2019	115	115	21
Dec 2019	216	216	15
Jan 2020	86	86	20
Feb 2020	97	95	14
Mar 2020	104	104	20
Apr 2020	104	104	21
May 2020	93	92	17
Jun 2020	69	68	10
Jul 2020	45	50	8
Aug 2020	52	52	21
Sep 2020	67	65	10
Oct 2020	121	119	18
Nov 2020	138	137	12
Dec 2020	110	108	19
Jan 2021	137	137	32
Feb 2021	97	97	27
Mar 2021	54	54	13
Apr 2021	64	64	21
May 2021	62	62	31
Jun 2021	36	37	8
Jul 2021	46	46	21
Aug 2021	78	77	24
Sep 2021	140	141	20
Oct 2021	267	271	80
Nov 2021	242	243	75
Dec 2021	157	157	20
Jan 2022	124	139	22
Feb 2022	169	177	30
Mar 2022	193	207	41
Apr 2022	283	298	39
May 2022	260	279	44
Jun 2022	142	145	30
Jul 2022	113	116	14
Aug 2022	102	102	9
Sep 2022	140	146	36
Oct 2022	226	240	39
Nov 2022	162	168	24
Dec 2022	123	122	14
Jan 2023	115	121	13
Feb 2023	174	179	22
Mar 2023	155	161	16
Apr 2023	109	118	11
May 2023	143	148	19
Jun 2023	141	143	8
Jul 2023	239	241	20
Aug 2023	273	281	26
Sep 2023	145	153	17
Oct 2023	214	219	32
Nov 2023	265	269	30
Dec 2023	648	81	14
Jan 2024	222	5	3
Feb 2024	260	10	5
Mar 2024	357	21	2
Total	16358	28176	4827

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