Table 3.

Multiple regression variables and assignment

Variables	Assignment
Annual revenue for family (thousands)	1 = < 50; =2 = 50 ~ 100; 3 = 100 ~ 150; 4=150 ~ 200; 5=200 ~ 250; 6=250 ~ 300; 7=300 ~ 350; 8=350 ~ 400; 9=400 ~ 450; 10=450 ~ 500; 11=> 500
Number of children	1=1; 2=2; 3=3
Number of tooth brushing sessions	1=0; 2=1; 3=2
Parents helping children with tooth brushing	1=Yes; 0=No ;
Children’s consumption of sweets	0=Rarely/never; 1=1 ~ 2 times per month; 2=1 time per week; 3=2 ~ 6 times per week; 4=1 time per day; 5=≥ 2 times per day;
Understanding of oral health	1 ~ 6, The higher the score, the better they understand
Understanding of methods of restoration	1=No understanding; 2=Basic understanding; 3=Understand a lot