Creating a total physical activity

[epi101]

Dear users, 

I am trying to create a overall total physical activity variable. 

This is my code: 

*TOTAL LEVEL OF PHYSICAL ACTIVITY (MET_hrs/WEEK);
TOTAL_PAHRS= MET_MODRECHRS + MET_VIGRECHRS + MET_MODWORKHRS + MET_VIGWORKHRS;

The problem with this is that is only taking those individuals who have values in each one of these variables and creating one. Which is increasing missing values. 

My question is how do I create a variable that includes individuals who do all of these type of physical activity or do only one, or  a combination.  

My main goal is to create a final variable that assigns each individuals with a total physical activity MET score. 

Thank you for your help!

[PaigeMiller]

Duplicate thread.

Please place all replies at: https://communities.sas.com/t5/SAS-Procedures/creating-a-variable/m-p/511077#M73040