I'd like to request for some explanation on how to calculate GLOBAL SCORE in Stata. I am not sure if this is the standard term for it, but I see many authors report this method using Stata.

I am quoting the text from a study where the authors use 12 different types of disability to calculate the score:

The results of the 12 items are summed up to obtain a global score expressed on a continuous scale from 0 (no disability) to 100 (full disability)
The questions are whether or not the individual has difficulty in: 1) eating 2) cooking 3) bathing 4) walking 5) standing for long 6) going out 7) using public transport 8) meeting friends 9) social events 10) learning a new task 11) remembering an address and 12) getting dressed. All questions are coded as 1 (yes) and no (0).

I use Stata 14 and the following study was done using 15.1.
Array

Thanks in advance!