Table 2.
Multiple Linear Regression Models With Minutes of Nightly CPAP Use as Dependent Variable
| Variable | Model 2A: β-Coefficient for Minutes of Nightly CPAP Use (95% CI)a | P Value | Model 2B: β-Coefficient for Minutes of Nightly CPAP Use (95% CI)b | P Value | Model 2C: β-Coefficient for Minutes of Nightly CPAP Use (95% CI)c | P Value |
|---|---|---|---|---|---|---|
| Sex | ||||||
| Male | 1 | ... | 1 | ... | 1 | ... |
| Female | –1.7 (–6.2 to 2.8) | .460 | 3.1 (–1.7 to 7.9) | .208 | 7.3 (2.3-12.4) | .005 |
| Age, y | ||||||
| < 40 | 1 | ... | 1 | ... | 1 | ... |
| 40-60 | 13.6 (5.7-21.4) | .001 | 7.5 (–0.8 to 15.7) | .076 | 7.6 (–0.9 to 16.2) | .079 |
| ≥ 60 | 33.8 (26.0-41.6) | < .001 | 26.3 (17.6-34.9) | < .001 | 27.0 (18.0-36.0) | < .001 |
| BMI, kg/m2 | ||||||
| < 25 | ... | ... | ... | ... | 1 | ... |
| 25-< 30 | ... | ... | ... | ... | 10.0 (1.7-18.4) | .018 |
| 30-< 35 | ... | ... | ... | ... | 10.8 (2.3-19.2) | .012 |
| ≥ 35 | ... | ... | ... | ... | 6.5 (–2.3 to 15.2) | .146 |
| AHI, events/h | ||||||
| < 5 | ... | ... | ... | ... | 1 | ... |
| 5-< 15 | ... | ... | ... | ... | 25.8 (3.2-48.4) | .025 |
| 15-< 30 | ... | ... | ... | ... | 62.9 (40.8-85.0) | < .001 |
| ≥ 30 | ... | ... | ... | ... | 84.4 (62.4-106.4) | < .001 |
| ESS score | ... | ... | ... | ... | ... | ... |
| < 7 | ... | ... | ... | ... | 1 | ... |
| 7-10 | ... | ... | ... | ... | 6.5 (0.5-12.5) | .032 |
| 11-15 | ... | ... | ... | ... | 13.7 (7.9-19.5) | < .001 |
| > 16 | ... | ... | ... | ... | 17.2 (10.3-24.1) | < .001 |
| Use of humidifier | ... | ... | ... | ... | 8.4 (4.1-12.7) | < .001 |
| Civil status | ||||||
| Unmarried | ... | ... | 1 | ... | 1 | ... |
| Married | ... | ... | 20.5 (14.8-25.6) | < .001 | 20.6 (14.9-26.3) | < .001 |
| Divorced | ... | ... | –6.8 (–13.7 to 0.2) | .056 | –5.2 (–12.4 to 2.0) | .415 |
| Widower or widow | ... | ... | 3.9 (–7.2 to 15.1) | .489 | 0.1 (–11.6 to 11.8) | .984 |
| Educational level | ||||||
| Low (≤ 9 y) | ... | ... | 1 | ... | 1 | ... |
| Medium (10-12 y) | ... | ... | 3.1 (–2.2 to 8.4) | .256 | 2.3 (–3.2 to 7.9) | .415 |
| High (≥ 13 y) | ... | ... | 13.2 (7.0-19.4) | < .001 | 12.8 (6.3-19.2) | < .001 |
| Household total income (index-linked) | ||||||
| Quartile 1 (lowest income) | ... | ... | 1 | ... | 1 | ... |
| Quartile 2 | ... | ... | 6.1 (0.2-12.0) | .043 | 8.5 (2.3-14.6) | .007 |
| Quartile 3 | ... | ... | 10.4 (4.3-16.5) | .001 | 12.1 (5.8-18.5) | < .001 |
| Quartile 4 (highest income) | ... | ... | 15.9 (9.5-22.3) | < .001 | 17.0 (10.3-23.7) | < .001 |
| Birth country | ||||||
| Born abroad | ... | ... | 1 | ... | 1 | ... |
| Born in Sweden, two foreign parents | ... | ... | 10.7 (–4.9 to 26.3) | .179 | 3.2 (–12.9 to 19.3) | .698 |
| Born in Sweden, one native parent | ... | ... | 29.0 (18.3-39.8) | < .001 | 25.5 (14.4-36.6) | < .001 |
| Born in Sweden, two native parents | ... | ... | 29.3 (22.7-36.0) | < .001 | 27.2 (20.2-34.2) | < .001 |
AHI = apnea-hypopnea index; ESS = Epworth Sleepiness Scale.
a
Adjusted for sex and age.
b
Adjusted for sex, age, and socioeconomic factors.
c
Adjusted for all variables in the table.