Table 1. Demographic data of 20 families.

Personal particulars of 20 participants:
Sex of participants	20 mothers
Age of participants	2 were 28 years old
	7 were between 30–35 years old
	8 were between 36–40 years old
	3 were between 41–45 years old
How many children in the families?	3 families had 1 children
	14 families had 2 children
	3 families had 3 children
Employment of main caregivers	15 housewife
	5 full time worker
Who is/are the main caregiver(s) of the child(ren)?	15 children were care by mothers
	1 child was cared by both father and working mother
	4 children were cared by grandmothers and working mothers.
Education of main caregivers	10 mothers received secondary school education
	10 mothers received tertiary education
Monthly household income (HKD)	1 was under 10,000
	10 were 10,000–20,000
	5 were 20,000–40,000
	4 were over 40,000