Table 5.
Summary of models employed in linear regression analysis.
| Model name | Covariates | Model usage |
|---|---|---|
| MAge | Age (years) | Comparison with low-altitude univariate SaO2 model (Crapo, et al.3) |
| MRef | Age (years) | Comparison with reference SaO2 model (Crapo, et al.3) |
| Height (cm) | ||
| Weight (kg) | ||
| Barometric pressure (mmHg) | ||
| Sex (categorical) | ||
| M1 | Age–40 (years) | Proposed full-cohort SpO2 linear model |
| BMI–25 (kg/m2) | ||
| Home altitude (km) | ||
| Sex (categorical) | ||
| Race/ethnicity (categorical) | ||
| M1,sex | Age–40 (years) | Sex-stratified analysis |
| BMI–25 (kg/m2) | ||
| Home altitude (km) | ||
| Race/ethnicity (categorical) | ||
| M1,race−ethn. | Age–40 (years) | Race/ethnicity-stratified analysis |
| BMI–25 (kg/m2) | ||
| Home altitude (km) | ||
| Sex (categorical) |
M1,sex differs from M1 only by the omission of the categorical variable encoding sex. M1,race−ethn. differs from M1 only by the omission of the categorical variables encoding race/ethnicity.