Table III.
OLS regression results for the associations between intelligence test scores and 12-month intoxication frequency (measured categorically, treated as continuous) at T3 and T4.
| Model 1 |
Model 2 |
Model 3 |
Model 4 |
|
|---|---|---|---|---|
| Coefficient |
Coefficient |
Coefficient |
Coefficient |
|
| (robust SE) | (robust SE) | (robust SE) | (robust SE) | |
| Panel 1 | ||||
| Dependent variable: 12-month intoxication frequency (T3) | ||||
| Intelligence score (stanines) | 0.005 | 0.005 | 0.014 | 0.010 |
| (0.035) | (0.036) | (0.036) | (0.035) | |
| Observations | 787 | 787 | 787 | 787 |
| R2 | 0.014 | 0.066 | 0.102 | 0.146 |
| Adjusted R2 | 0.012 | 0.029 | 0.060 | 0.104 |
| Panel 2 | ||||
| Dependent variable: 12-month intoxication frequency (T4) | ||||
| Intelligence score (stanines) | 0.051 | 0.027 | 0.029 | 0.027 |
| (0.031) | (0.033) | (0.033) | (0.033) | |
| Observations | 915 | 915 | 915 | 915 |
| R2 | 0.013 | 0.074 | 0.091 | 0.102 |
| Adjusted R2 | 0.011 | 0.043 | 0.055 | 0.064 |
| Controls: | ||||
| Age | yes | yes | yes | yes |
| Parents’ educational level (register) | yes | yes | yes | |
| Parents’ employment status at T1 | yes | yes | yes | |
| Parents’ occupational class at T1 | yes | yes | yes | |
| Lived with both parents at T1 | yes | yes | yes | |
| Parental Bonding Instrument (PBI) | yes | yes | ||
| How often seen parents drunk | yes | yes | ||
| Conduct problems scale | yes | |||
| Best friend drinks weekly | yes | |||
Note: T1 is survey wave 1, when respondents were around 15 years old. T3 is survey wave 3, when respondents were around 22 years old. T4 is survey wave 4, when respondents were around 28 years old.
No coefficients were statistically significant (p > 0.05).