Comparison of methods for modelling a count outcome with excess zeros: application to Activities of Daily Living (ADL-s)

Paola Zaninotto; Emanuela Falaschetti

doi:10.1136/jech.2008.079640

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Theory and methods

Comparison of methods for modelling a count outcome with excess zeros: application to Activities of Daily Living (ADL-s)

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	Abstract	Full	Pdf
Jul 2010	7	1	1
Aug 2010	97	13	35
Sep 2010	48	17	11
Oct 2010	73	28	27
Nov 2010	59	15	18
Dec 2010	15	12	6
Jan 2011	43	8	9
Feb 2011	291	55	75
Mar 2011	87	30	43
Apr 2011	77	17	31
May 2011	80	16	29
Jun 2011	63	7	16
Jul 2011	53	8	14
Aug 2011	43	9	11
Sep 2011	34	5	14
Oct 2011	50	3	7
Nov 2011	71	5	9
Dec 2011	66	5	7
Jan 2012	82	4	4
Feb 2012	64	7	4
Mar 2012	63	7	8
Apr 2012	72	10	6
May 2012	60	17	9
Jun 2012	51	7	10
Jul 2012	43	9	7
Aug 2012	59	3	12
Sep 2012	75	0	3
Oct 2012	54	11	7
Nov 2012	78	9	7
Dec 2012	75	7	10
Jan 2013	93	2	1
Feb 2013	43	3	4
Mar 2013	70	3	6
Apr 2013	63	0	0
May 2013	58	5	5
Jun 2013	14	3	6
Jul 2013	44	3	6
Aug 2013	16	4	4
Sep 2013	23	2	8
Oct 2013	13	0	3
Nov 2013	26	2	2
Dec 2013	13	1	2
Jan 2014	17	1	2
Feb 2014	23	3	6
Mar 2014	31	3	6
Apr 2014	33	5	5
May 2014	28	2	3
Jun 2014	26	4	7
Jul 2014	33	4	0
Aug 2014	24	1	4
Sep 2014	16	2	4
Oct 2014	18	0	4
Nov 2014	13	4	1
Dec 2014	21	1	3
Jan 2015	9	0	2
Feb 2015	12	2	1
Mar 2015	15	4	4
Apr 2015	11	0	0
May 2015	23	1	7
Jun 2015	6	1	2
Jul 2015	14	2	2
Aug 2015	24	0	0
Sep 2015	23	2	3
Oct 2015	11	0	0
Nov 2015	12	0	1
Dec 2015	12	3	4
Jan 2016	13	2	2
Feb 2016	8	4	3
Mar 2016	12	2	2
Apr 2016	13	6	22
May 2016	13	2	3
Jun 2016	13	2	2
Jul 2016	15	0	2
Aug 2016	17	3	4
Sep 2016	28	1	2
Oct 2016	44	4	7
Nov 2016	29	3	2
Dec 2016	15	1	3
Jan 2017	19	0	1
Feb 2017	13	2	7
Mar 2017	15	4	1
Apr 2017	21	0	0
May 2017	14	1	1
Jun 2017	13	1	4
Jul 2017	43	2	2
Aug 2017	18	0	1
Sep 2017	24	2	3
Oct 2017	22	3	3
Nov 2017	84	1	0
Dec 2017	40	3	2
Jan 2018	21	5	3
Feb 2018	32	2	2
Mar 2018	39	4	5
Apr 2018	56	9	4
May 2018	44	4	3
Jun 2018	38	1	0
Jul 2018	33	7	6
Aug 2018	55	7	9
Sep 2018	24	1	1
Oct 2018	29	5	3
Nov 2018	55	2	1
Dec 2018	25	1	1
Jan 2019	30	5	3
Feb 2019	60	5	2
Mar 2019	43	2	1
Apr 2019	58	7	4
May 2019	43	3	2
Jun 2019	21	0	2
Jul 2019	46	8	3
Aug 2019	13	4	1
Sep 2019	24	2	1
Oct 2019	62	4	3
Nov 2019	38	4	2
Dec 2019	38	5	2
Jan 2020	16	0	4
Feb 2020	40	1	4
Mar 2020	11	1	0
Apr 2020	114	20	5
May 2020	38	5	3
Jun 2020	45	3	1
Jul 2020	35	1	1
Aug 2020	38	7	2
Sep 2020	35	3	1
Oct 2020	65	2	0
Nov 2020	52	0	2
Dec 2020	30	3	3
Jan 2021	36	5	6
Feb 2021	63	5	10
Mar 2021	29	1	6
Apr 2021	113	10	6
May 2021	8	1	0
Jun 2021	1	1	0
Jul 2021	2	1	0
Aug 2021	2	2	1
Sep 2021	6	5	2
Oct 2021	45	7	5
Nov 2021	20	2	0
Dec 2021	44	2	1
Jan 2022	71	5	3
Feb 2022	51	4	3
Mar 2022	126	10	4
Apr 2022	78	5	1
May 2022	58	3	6
Jun 2022	80	5	1
Jul 2022	38	1	1
Aug 2022	65	8	3
Sep 2022	58	4	2
Oct 2022	104	2	1
Nov 2022	60	4	2
Dec 2022	76	4	2
Jan 2023	44	1	1
Feb 2023	65	2	2
Mar 2023	25	7	2
Apr 2023	79	4	3
May 2023	47	4	3
Jun 2023	38	2	2
Jul 2023	37	2	0
Aug 2023	83	9	5
Total	6608	738	821

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