Table 1.
Descriptive Statistics of the Daily Alcohol Use, Sleep Duration, and Next-day Tiredness Variables for Younger and Older Age Groups
| Intraindividual Means and Standard Deviations | Intraindividual Correlation | |||
|---|---|---|---|---|
|
| ||||
| iMean (SD) | iSD (SD) | Alcohol | Sleep | |
| Younger Adults (n = 91) | ||||
|
| ||||
| Alcohol (drinks) | 0.64 (0.52) | 1.19 (0.72) | -- | |
| Sleep (hours) | 7.20 (0.68) | 1.27 (0.38) | −0.11 [−0.53, 0.23] | -- |
| Tiredness (0 to 7) | 3.29 (0.81) | 1.10 (0.30) | 0.07 [−0.20, 0.46] | −0.36 [−0.81, 0.01] |
|
| ||||
| Older Adults (n = 75) | ||||
|
| ||||
| Alcohol | 0.61 (0.63) | 0.61 (0.36) | -- | |
| Sleep | 7.06 (0.84) | 0.68 (0.27) | −0.03 [−0.33, 0.35] | -- |
| Tiredness | 2.19 (0.93) | 0.68 (0.28) | −0.01 [−0.26, 0.29] | −0.30 [−0.77, 0.09] |
Notes: iMean = intraindividual mean; iSD = intraindividual standard deviation; SD = sample-level standard deviation. Alcohol use is reported in number of drinks (1 drink = 14 grams alcohol). Correlation matrices for each age group contain the average intraindividual correlation, and the range of those correlations in brackets [min, max].