Table 4.
Multiple regression predicting poor sleep quality (PSQI Total Score)
| Coefficient | [95% CI] | |
|---|---|---|
| Age at Baseline (years) | −0.03* | [−0.06,−0.00] |
| Gender (female = 1) | 0.53** | [0.13,0.92] |
| Race (reference = white) | ||
| Black | −0.04 | [−0.64,0.56] |
| Asian | 1.17 | [−0.41,2.75] |
| American Indian | 2.03 | [−0.37,4.43] |
| More than one | −0.97 | [−2.73,0.79] |
| Missing | 1.52 | [−0.98,4.03] |
| Ethnicity (1 = Hispanic) | 0.48 | [−0.63,1.58] |
| Smoking, pack years | −0.00 | [−0.01,0.01] |
| Currently smoking, as of 1 month ago | 0.35 | [−0.10,0.81] |
| Six minute walk distance (m) | 0.00 | [−0.00,0.00] |
| FEV1 as % predicted (%) | 0.01* | [0.00,0.02] |
| Currently using Theophylline | −0.74 | [−1.99,0.52] |
| Currently using Oral Corticosteroids | −1.05 | [−2.12,0.03] |
| Supplemental oxygen usage | −0.13 | [−0.69,0.44] |
| Inhaled steroids usage in the last 3 months | 0.06 | [−0.39,0.51] |
| Inhaled bronchodilators in the last 3 months | 0.59* | [0.12,1.06] |
| Nebulized bronchodilators usage in the last 3 months | 1.03** | [0.42,1.65] |
| Coughing last night (Reference = None/Rare) | ||
| Occasional | 0.60* | [0.03,1.18] |
| Frequent/Constant | 2.52*** | [1.38,3.66] |
| Missing | −0.83 | [−1.98,0.32] |
| Berlin Questionnaire Sleep Apnea Risk (Reference = Low Risk) | ||
| High Risk | 1.04*** | [0.58,1.49] |
| Missing | 0.65* | [0.14,1.15] |
| HADS Anxiety Score | 0.25*** | [0.18,0.32] |
| HADS Depression Score | 0.29*** | [0.21,0.37] |
| Observations | 1087 | |
95% confidence intervals in brackets; overall model F25,1061 = 23.11, p < .001, RMSE = 3.16, R2 = 0.35, Adjusted R2 = 0.34.
*p < .05; **p < .01; ***p < .001.