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RE: st: age adjusted incidence rates in STATA


From   Nita Forouhi <nf250@medschl.cam.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: age adjusted incidence rates in STATA
Date   Fri, 4 Mar 2005 12:05:36 -0000

Thanks Svend for pointing me to dstdize, but I have a few specific queries
on that.

My original question was about how to use STATA to give age-adjusted or
age-standardised incidence rates.

1. for dstdize - How can i tell STATA that it should use person-time data
(pyar) rather than population count?

2. Do i have to use an external reference standard population (say the
European standard population - or suggestions for others welcome), or can
the combined population (or person time) of the study itself by each age
category be used instead?

so say, crude incidence in cohort is: 4.1 per 1000 pyar (total pyar =
39570), and in each of 3 age categories the incidence rates and person time
is as below (computed using strate command, for outcome = chd-death:

Age category	incidence rate per 1000		person-time	(yrs)
age 40-49		1.4					17700	
age 50-59		4.9					15500
age 60-69		9.3					6370	

Then how can i tell stata to give me age-standardised rate? 

(PS - have attached a small dataset in case that will help - outcome var is
chddth_any, agegr3 is the 3 age categories)


many thanks

Nita	

		

-----Original Message-----
From: Svend Juul [mailto:SJ@soci.au.dk]
Sent: 02 March 2005 14:37
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: age adjusted incidence rates in STATA


This is an example of "direct" standardization. See [R] dstdize.
 
Svend
 
________________________________________________________ 
 
Svend Juul
Institut for Folkesundhed, Afdeling for Epidemiologi
(Institute of Public Health, Department of Epidemiology)
Vennelyst Boulevard 6 
DK-8000 Aarhus C,  Denmark 
Phone, work:  +45 8942 6090 
Phone, home:  +45 8693 7796 
Fax:          +45 8613 1580 
E-mail:       sj@soci.au.dk 
_________________________________________________________ 

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