Table 1
Assigned Scores to Sleep Latency and Sleep Efficiency.
| Sleep Latency (min) | Sleep Efficiency (%) | Sleep Quality Score |
|---|---|---|
| <15 min | >95 | 0 |
| 15–30 min | 85–95 | 1 |
| 30–45 min | 75–85 | 2 |
| 45–60 min | 65–75 | 3 |
| >60 | <65 | 4 |
Table 2
Means/Frequencies, Standard Deviations (SD) and Pearson’s Correlations for all Variables.
| Variable | Mean (SD)/Frequency | Correlations | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Age | Gender | LS | SQ | MSD | VoSD | RTD | BD | |||||||||
| aAge (category) | 2.66 (0.75) | – | ||||||||||||||
| Gender (1 = female, 2 = male) | 479 (69.9%) female | .147 | *** | – | ||||||||||||
| Life satisfaction | 23.08 (6.41) | .027 | –.026 | – | ||||||||||||
| Sleep quality | 5.79 (3.00) | –.004 | –.087 | * | –.337 | *** | – | |||||||||
| Mean sleep duration (hours) | 8.22 (0.93) | –.142 | ** | –.153 | ** | .128 | ** | –.387 | *** | – | ||||||
| Variability of sleep duration | 12.09 (6.84) | –.020 | .004 | –.212 | *** | .178 | *** | –.186 | *** | – | ||||||
| Rise time deviation (hours) | 1.42 (0.61) | –.053 | –.024 | –.148 | ** | .104 | * | –.098 | * | .704 | *** | – | ||||
| Bedtime deviation (hours) | 0.98 (0.54) | –.115 | ** | –.102 | * | –.077 | .008 | –.031 | .159 | *** | .433 | *** | – | |||
[i] a Age categories were as follows: 19 years or younger = 1, 20–22 years = 2, 23–25 years = 3, 26–28 years = 4, 29–31 years = 5 and 32 years or older = 6.
* p < .05. ** p < .01. *** p < .001 (2-tailed).
Table 3
Hierarchical Multiple Regression Analysis Predicting Life Satisfaction from Sleep Quality, Mean Sleep Duration, Variability of Sleep Duration and Rise Time Deviation (N = 474).
| Δ R2 | β | b | SE | ||||
|---|---|---|---|---|---|---|---|
| Step 1 | .005 | ||||||
| Gender | –.043 | –.604 | .649 | ||||
| Age | .061 | .513 | .390 | ||||
| Step 2 | .138 | *** | |||||
| Gender | –.077 | –1.079 | .617 | ||||
| Age | .055 | .465 | .366 | ||||
| Sleep quality | –.340 | *** | –.711 | *** | .101 | ||
| Sleep duration | –.056 | –.402 | .347 | ||||
| Variability of sleep duration | –.159 | ** | –.146 | ** | .057 | ||
| Rise time deviation | .022 | .234 | .643 | ||||
| Total R2 | .143 | *** | |||||
[i] * p < .05. ** p < .01. *** p < .001.