topic Re: Compare means of 2 variables from admission to discharge in SAS Programming

Compare means of 2 variables from admission to discharge

seltonsy — Thu, 12 Oct 2017 18:13:08 GMT

Hi,

I have a data with glucose levels at admission and at discharge in 2 different variables. I want to calculate the P-value for the difference in means between these 2 variables. It means, I want to test if there was a significant change in the glucose level with time in this population.

Thanks

SAS Output

Variable

HBA1C_ADM

HBA1C_DIS

Mean

7.1

6.5

1.0

0.8

Re: Compare means of 2 variables from admission to discharge

Reeza — Thu, 12 Oct 2017 19:02:52 GMT

@seltonsy wrote:

Hi,

I have a data with glucose levels at admission and at discharge in 2 different variables. I want to calculate the P-value for the difference in means between these 2 variables. It means, I want to test if there was a significant change in the glucose level with time in this population.

Thanks

SAS Output

Variable

HBA1C_ADM

HBA1C_DIS

Mean

7.1

6.5

SD

1.0

0.8

@seltonsy So what is your question to us? Which part, specifically, are you having issues with?

Re: Compare means of 2 variables from admission to discharge

seltonsy — Thu, 12 Oct 2017 19:16:52 GMT

sorry if it wasn't clear enough,

I'd like to know what is the proc to use that can perform this test. Compre the means of the two variables and provide p-values (i.e. if the means of the 2 variables are significantly different or not).

Thanks in advance.

Re: Compare means of 2 variables from admission to discharge

Reeza — Thu, 12 Oct 2017 19:25:03 GMT

PROC TTEST or PROC ANOVA

Check both of the examples sections.

I think, this should be a PAIRED T-Test, so make sure you decide explicitly if it's paired or not.

Re: Compare means of 2 variables from admission to discharge

seltonsy — Thu, 12 Oct 2017 19:36:46 GMT

Thanks,

Paired t test is the right answer I guess,

Here is what I did,

proc ttest data=cohort_1 ;
paired HBA1C_ADM*HBA1C_FIN;
run;