vars_ph_p_sds__da: Compute "Sleep Disturbance Scale [Parent] (Disorder of arousal): Sum
[Validation: No more than 0 missing or declined]"
Description
Computes the summary score ph_p_sds__da_sum
Sleep Disturbance Scale [Parent] (Disorder of arousal): Sum
[Validation: No more than 0 missing or declined]