Sample selection and validity of exposure–disease association estimates in cohort studies

Costanza Pizzi; Bianca De Stavola; Franco Merletti; Rino Bellocco; Isabel dos Santos Silva; Neil Pearce; Lorenzo Richiardi

doi:10.1136/jech.2009.107185

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Theory and methods

Sample selection and validity of exposure–disease association estimates in cohort studies

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	Abstract	Full	Pdf
Oct 2010	54	3	16
Nov 2010	29	11	4
Dec 2010	43	12	8
Jan 2011	57	6	7
Feb 2011	44	3	4
Mar 2011	54	11	6
Apr 2011	273	32	95
May 2011	69	12	28
Jun 2011	29	12	19
Jul 2011	33	7	4
Aug 2011	30	5	5
Sep 2011	31	4	5
Oct 2011	58	3	8
Nov 2011	46	7	1
Dec 2011	50	3	3
Jan 2012	62	8	10
Feb 2012	49	1	4
Mar 2012	48	4	4
Apr 2012	45	0	1
May 2012	86	3	5
Jun 2012	44	2	3
Jul 2012	45	5	8
Aug 2012	34	3	4
Sep 2012	70	6	9
Oct 2012	80	2	8
Nov 2012	55	2	4
Dec 2012	40	3	2
Jan 2013	65	3	5
Feb 2013	69	4	4
Mar 2013	51	2	5
Apr 2013	47	2	8
May 2013	23	1	4
Jun 2013	15	1	2
Jul 2013	16	6	3
Aug 2013	14	3	3
Sep 2013	29	0	3
Oct 2013	40	9	11
Nov 2013	37	1	5
Dec 2013	34	5	4
Jan 2014	14	1	2
Feb 2014	22	3	6
Mar 2014	35	3	6
Apr 2014	24	1	2
May 2014	25	2	4
Jun 2014	26	2	2
Jul 2014	26	1	3
Aug 2014	12	3	4
Sep 2014	29	3	3
Oct 2014	56	1	4
Nov 2014	38	1	1
Dec 2014	20	0	1
Jan 2015	25	3	4
Feb 2015	6	2	2
Mar 2015	14	4	2
Apr 2015	22	4	6
May 2015	13	2	3
Jun 2015	11	2	3
Jul 2015	20	9	10
Aug 2015	7	3	4
Sep 2015	60	3	6
Oct 2015	7	2	1
Nov 2015	3	2	1
Dec 2015	18	4	8
Jan 2016	19	2	2
Feb 2016	27	6	8
Mar 2016	8	3	3
Apr 2016	19	5	5
May 2016	21	4	4
Jun 2016	16	2	3
Jul 2016	23	2	3
Aug 2016	21	0	2
Sep 2016	26	4	1
Oct 2016	24	3	4
Nov 2016	12	3	4
Dec 2016	25	3	2
Jan 2017	15	2	1
Feb 2017	13	1	1
Mar 2017	18	10	4
Apr 2017	12	3	2
May 2017	15	6	1
Jun 2017	23	3	0
Jul 2017	39	12	2
Aug 2017	31	4	0
Sep 2017	59	11	5
Oct 2017	31	2	1
Nov 2017	53	2	3
Dec 2017	24	8	10
Jan 2018	27	5	2
Feb 2018	64	10	4
Mar 2018	46	11	3
Apr 2018	49	3	2
May 2018	39	5	3
Jun 2018	42	3	1
Jul 2018	33	9	4
Aug 2018	28	2	1
Sep 2018	47	3	2
Oct 2018	43	9	7
Nov 2018	30	4	1
Dec 2018	15	1	0
Jan 2019	33	3	1
Feb 2019	44	2	2
Mar 2019	48	8	1
Apr 2019	27	6	1
May 2019	45	3	5
Jun 2019	39	3	4
Jul 2019	30	5	1
Aug 2019	18	2	1
Sep 2019	34	6	1
Oct 2019	37	4	2
Nov 2019	62	3	4
Dec 2019	37	3	3
Jan 2020	43	1	3
Feb 2020	23	5	6
Mar 2020	57	10	8
Apr 2020	43	6	1
May 2020	30	3	1
Jun 2020	38	3	4
Jul 2020	45	5	1
Aug 2020	25	3	2
Sep 2020	48	2	0
Oct 2020	89	8	2
Nov 2020	58	3	0
Dec 2020	40	3	2
Jan 2021	99	5	3
Feb 2021	78	5	5
Mar 2021	124	12	4
Apr 2021	60	7	3
May 2021	3	1	1
Jun 2021	6	5	2
Jul 2021	6	3	0
Aug 2021	17	15	12
Sep 2021	9	8	7
Oct 2021	56	3	0
Nov 2021	80	5	0
Dec 2021	139	4	5
Jan 2022	125	0	1
Feb 2022	131	4	3
Mar 2022	128	6	3
Apr 2022	50	1	2
May 2022	107	7	1
Jun 2022	77	1	0
Jul 2022	66	2	2
Aug 2022	94	6	2
Sep 2022	97	12	4
Oct 2022	186	9	7
Nov 2022	78	4	0
Dec 2022	105	6	2
Jan 2023	95	9	0
Feb 2023	73	2	3
Mar 2023	169	7	4
Apr 2023	92	5	3
May 2023	67	5	4
Jun 2023	60	2	1
Jul 2023	77	11	1
Aug 2023	76	1	0
Sep 2023	79	3	1
Oct 2023	125	2	2
Nov 2023	72	5	0
Dec 2023	140	9	1
Jan 2024	120	6	20
Feb 2024	40	3	4
Mar 2024	83	11	2
Apr 2024	94	7	3
May 2024	62	2	0
Jun 2024	38	6	4
Jul 2024	120	9	1
Aug 2024	144	8	2
Total	8308	778	702

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