Standardisation

#1
Hi to everybody,

I am new of the forum,

I would like to create a normalisation (or standardised) table for one test based on the Spanish population

The test is composed of 3 items.
I would like to create one standard value Table based on two variables (sex, the month of age).

Finally, classified the sum of standard value per z-score. What do you think?

My problem is to create the three tables. Does anyone have some suggestions about the analysis?

With kind regard

Sveva