Table 1.
Association of sleepiness and quality of life with age, gender, BMI and % time in deep sleep (ORP < 0.5) and full wakefulness (ORP > 2.25)*
| Variable | ESS (n = 3447) | SF36-P (n = 3270) | SF36-M (n = 3270) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Estimate | t-value | Pr > [t] | Estimate | t-value | Pr > [t] | Estimate | t-value | Pr > [t] | |
| Overall Model | r 2 = 0.03, p < .0001 | r 2 = 0.14, p < .0001 | r 2 = 0.03, p < .0001 | ||||||
| Intercept | 5.0 | 7.6 | <0.0001 | 75.8 | 53.7 | < 0.0001 | 45.1 | 35.1 | <0.0001 |
| Age (years) | −0.001 | −0.1 | 0.92 | −0.23 | −16.0 | <0.0001 | 0.11 | 7.9 | < 0.0001 |
| Female | −0.962 | −6.5 | <0.0001 | −1.77 | −5.6 | <0.0001 | −0.93 | −3.2 | <0.001 |
| BMI (kg/m2) | 0.091 | 6.1 | <0.0001 | −0.49 | −15.3 | <0.0001 | −0.01 | −0.31 | 0.76 |
| Deep sleep (%TRT) | 0.000 | 0.0 | 0.996 | 0.01 | 0.9 | 0.395 | 0.07 | 5.5 | <0.0001 |
| Full wakefulness (%TRT) | −0.035 | −3.7 | 0.0002 | −0.06 | −3.0 | 0.003 | −0.01 | −0.3 | 0.77 |
* All eligible SHHS participants were included in the models. ORP, odds ratio product; ESS, Epworth Sleepiness Score; SF36(P), standardized score of SF-36 physical component; SF36-M, standardized score of SF-36 mental component. BMI, body mass index; TRT, total recording time. All three multiple linear regression models included all five variables, and each overall model was highly significant (p < .0001).
Bold values are individual variables that were significantly associated with the indicated health outcome by multiple linear regression.