Table 2.
Comparison of initial split-night study data between sites
| Altitude, meters (Site) | N | AHI (SD) | Low SpO2 (SD) | % CAI > 5.0 in Dx portion | Split-night titration adequacy (SD) | % CAI > 5.0 in Tx portion | Split-night titration rated adequate or unacceptable & 2nd titration requested | # Having second titration |
|---|---|---|---|---|---|---|---|---|
| 1421 (1) | 150 | 45.8 (29.7) | 73.5 (11.3) | 4.7 | 1.44 (0.82) | 4.1 | 9/150 (6%) | 4/150 (3%) |
| 1808 (2) | 150 | 50.1 (35.05) | 75.5 (10.7) | 22.7 | 1.57 (0.96) | 22.6 | 26/150 (17%) | 12/150 (8%) |
| 2165 (3) | 142 | 46.7 (26.8) | 74.2 (9.61) | 33.8 | 1.78 (1.025) | 38.7 | 33/142 (23%) | 15/142 (11%) |
| Sig. dif. | 3 > 1 (p < 0.05) | 3 > 1 (p < 0.01) | 3 > 1 (p = 0.01) | 3 > 1 (p = 0.01) | p = 0.025 | |||
| 2 > 1 (p = 0.02) | 2 > 1 (p = 0.02) |
Analysis of covariance comparing titration adequacy across 3 altitude levels, controlling for age, was significant for the effect of altitude; p = 0.017.