Evaluating longitudinal relationships between parental monitoring and substance use in a multi-year, intensive longitudinal study of 670 adolescent twins.

The geospatial variables, time at home and time at school, were significantly positively correlated with one another at both the intercept ( r = 0.38) and quadratic slope levels ( r = 0.60) while correlations between their linear slopes ( r = 0.34) were of comparable magnitude but fell just short of statistical significance (results presented in Table 2 ).

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