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