The primary outcome, depression, was measured
using the Chinese version of the Depression,
Anxiety and Stress Scale-21 (DASS-21) (Lovibond and
Lovibond 1995). The secondary outcomes included
anxiety, stress, burden of care and quality of life and
were measured using the Chinese version of the Zarit
Burden Scale (Bédard et al 2001) and the World Health
Organization Quality of Life Measure-BREF (WHOQOLBREF)
Hong Kong (HK) (Leung et al 2005).