preferred_name: No verbal response (>2 yrs); no vocal response (<=2 yrs)
preferred_name_lc: no verbal response (>2 yrs); no vocal response (<=2 yrs)
label: No verbal response (>2 yrs); no vocal response (<=2 yrs)
label_lc: no verbal response (>2 yrs); no vocal response (<=2 yrs)