Measuring incidence rates - Revision history

Bosmana fem: /* FEM PAGE CONTRIBUTORS 2007 */

2023-04-10T21:50:15Z

FEM PAGE CONTRIBUTORS 2007

← Older revision		Revision as of 21:50, 10 April 2023
Line 60:		Line 60:
	1. Boice, J. D., and R. R. Monson. Breast cancer in women after repeated fluoroscopic examinations of the chest. Journal of the National Cancer Institute 1977 59: 823–832.		1. Boice, J. D., and R. R. Monson. Breast cancer in women after repeated fluoroscopic examinations of the chest. Journal of the National Cancer Institute 1977 59: 823–832.

	==FEM PAGE CONTRIBUTORS 2007==		<div style="display: inline-block; width: 25%; vertical-align: top; border: 1px solid #000; background-color: #d7effc; padding: 10px; margin: 5px;">
			'''FEM PAGE CONTRIBUTORS 2007'''
	;Editor		;Editor
	:Masja Straetemans		:Masja Straetemans
Line 71:		Line 72:
	:Lisa Lazareck		:Lisa Lazareck
	:Masja Straetemans		:Masja Straetemans
			</div>

	[[Category:Cohort studies]]		[[Category:Cohort studies]]

Bosmana fem at 20:39, 30 March 2023

2023-03-30T20:39:13Z

← Older revision		Revision as of 20:39, 30 March 2023
Line 7:		Line 7:

	[[File:1830.Page3 formula3a IRu.gif-550x0.png\|800px\|frameless\|left]]		[[File:1830.Page3 formula3a IRu.gif-550x0.png\|800px\|frameless\|left]]



Line 21:		Line 22:


	Example		==Example==

	Breast cancer cases and person-years of observation for women with tuberculosis repeatedly exposed to multiple x-ray fluoroscopies and unexposed women with tuberculosis		Breast cancer cases and person-years of observation for women with tuberculosis repeatedly exposed to multiple x-ray fluoroscopies and unexposed women with tuberculosis
Line 56:		Line 57:
	One can express the result by saying that the relative effect is 0.86 which would suggest an 86 % increased rate of breast cancer among exposed. One can also express the results by saying that the rate of breast cancer is 1.86 times higher in the exposed cohort than in the unexposed cohort.		One can express the result by saying that the relative effect is 0.86 which would suggest an 86 % increased rate of breast cancer among exposed. One can also express the results by saying that the rate of breast cancer is 1.86 times higher in the exposed cohort than in the unexposed cohort.

	References		=References=
	1. Boice, J. D., and R. R. Monson. Breast cancer in women after repeated fluoroscopic examinations of the chest. Journal of the National Cancer Institute 1977 59: 823–832.		1. Boice, J. D., and R. R. Monson. Breast cancer in women after repeated fluoroscopic examinations of the chest. Journal of the National Cancer Institute 1977 59: 823–832.

			==FEM PAGE CONTRIBUTORS 2007==
			;Editor
			:Masja Straetemans
			;Original Authors
			:Alain Moren
			:Jean Claude Desenclos
			:Marta Valenciano
			:Arnold Bosman
			;Contributors
			:Lisa Lazareck
			:Masja Straetemans


	[[Category:Cohort studies]]		[[Category:Cohort studies]]

Bosmana fem at 20:36, 30 March 2023

2023-03-30T20:36:47Z

← Older revision		Revision as of 20:36, 30 March 2023
Line 1:		Line 1:
			==Cohort studies measuring incidence rates==

			The computation of effects with incidence rates is similar to calculation of effects from incidence proportions (risk). The incidence rate of disease in exposed (IRe) and unexposed (IRu) can be computed as follows:

			[[File:0676.Page3 formula3a IRe.gif-550x0.png\|800px\|frameless\|left]]


			[[File:1830.Page3 formula3a IRu.gif-550x0.png\|800px\|frameless\|left]]


			A rate difference can be computed:

			The relative effect of the exposure on disease occurrence can be measured by computing the rate ratio minus 1.
			[[File:3757.Page3 formula4 relative effect.gif-550x0.png\|800px\|frameless\|left]]


			The rate ratio is:

			[[File:5008.Page3 formula5 rate ratio.gif-550x0.png\|800px\|frameless\|left]]



			Example

			Breast cancer cases and person-years of observation for women with tuberculosis repeatedly exposed to multiple x-ray fluoroscopies and unexposed women with tuberculosis

			{\| class="wikitable" style="text-align:right; vertical-align:bottom;"
			\|-
			! Radiation exposure
			! Person-years
			! Breast cancer
			! Rate/10000 p-y
			! Rate ratio
			! Rate difference
			! Relative effect
			\|-
			\| Yes
			\| 28010
			\| 14
			\| 14.6
			\| 1.86
			\| 6.7
			\| 0.86
			\|-
			\| NO
			\| 19017
			\| 15
			\| 7.9
			\|
			\|
			\|
			\|}

			Source: Boice & Monson [1]

			One can express the result by saying that the relative effect is 0.86 which would suggest an 86 % increased rate of breast cancer among exposed. One can also express the results by saying that the rate of breast cancer is 1.86 times higher in the exposed cohort than in the unexposed cohort.

			References
			1. Boice, J. D., and R. R. Monson. Breast cancer in women after repeated fluoroscopic examinations of the chest. Journal of the National Cancer Institute 1977 59: 823–832.

	[[Category:Cohort studies]]		[[Category:Cohort studies]]

Bosmana fem: Created page with " Category:Cohort studies"

2023-03-22T21:48:52Z

Created page with " Category:Cohort studies"

New page

[[Category:Cohort studies]]