Coefficients indicate standardized beta coefficients. Thin dashed arrows
represent nonsignificant relationships. Only coefficients for significant
relationships are presented. Epsilon indicates error terms. “y1”
and “y3” indicate “Year 1” and “Year
3”, respectively. Appendix D presents the full model with its exogenous variables
(i.e., age, gender, smoking at home, and socio-economic status). *p <
0.05, **p < 0.01, ***p < 0.001.