Table 1.
Means (Standard Deviations) on Elder and Younger Sibling Alcohol Use Measures
| Range | Elder Sibling | Younger Sibling |
χ2 on 1 df | p-value | |
|---|---|---|---|---|---|
| Ever used alcohol | 0 – 1 | .76 (.43) | .54 (.50) | 62.41 | <.001 |
| Frequency of alcohol usea | 0 – 9 | 3.32 (2.51) | 1.89 (2.22) | 97.63 | <.001 |
| Ever intoxicated | 0 – 1 | .65 (.48) | .39 (.49) | 71.26 | <.001 |
| Frequency of intoxicationsa | 0 – 9 | 2.49 (2.36) | 1.35 (2.04) | 72.79 | <.001 |
| How often drink to get drunkb | 0 – 5 | 2.41 (2.05) | 1.40 (1.95) | 68.89 | <.001 |
| Max drinks in one sittingc | 0 – 10 | 5.05 (3.78) | 3.13 (3.76) | 74.43 | <.001 |
NOTE:
a
Frequency items answered on a scale of 0 = Never to 9 = Every day or nearly every day,
b
how often they drank to get drunk answered on a scale of 0 = Never to 5 = Nearly every time or every time, and
c
max drinks on a single occasion answered on a scale of 0 = 0 drinks to 10 = 10+ drinks. Significant differences between elder and younger siblings were tested by constraining the parameters to be equal across groups and utilizing the chi-square difference test (χ2) on 1 degree of freedom (df) change to compare the chi-square value from the free and constrained models.