Table 2.
Multivariate Predictors of Lung Volumes
| Covariate | TLC β (95% CL) | FRC β (95% CL) | RV β (95% CL) | ERV β (95% CL) |
|---|---|---|---|---|
| BMI (kg/m2) | −38.7 (−59.2 to −18.2) | −73.9 (−89.2 to −58.6) | −40.4 (−54.0 to −26.7) | −32.2 (−42.0 to −22.3) |
| Time since injury (y) | −17.3 (−25.5 to −9.2) | −17.5 (−24.3 to −10.7) | −10.4 (−16.4 to −4.5) | −7.9 (−12.3 to −3.5) |
| Stature (cm) | 66.9 (53.1 to 80.7) | 33.4 (23.4 to 43.5) | 27.2 (18.4 to 36.0) | NA |
| Age (y) | NA | 17.1 (10.9 to 23.4) | 16.9 (11.0 to 22.8) | −2.8 (−6.7 to 1.1)* |
| MIP (cmH2O) | 4.0 (0.7 to 7.4) | NA | −3.2 (−5.5 to −0.9) | NA |
| Pack-years | NA | 5.3 (2.1 to 8.5) | 3.1 (0.3 to 6.0) | NA |
| MD-diagnosed COPD | NA | NA | 342.3 (56.6 to 628.0) | NA |
NOTE. All models are adjusted for level and severity of injury; variables without regression coefficients listed were not included in the final model for that lung volume; the units for β values are milliliters of lung volume divided by units of each specific variable; adjusted R2 values for the models were .39, .38, .36, and .27 for TLC, FRC, RV, and ERV, respectively.
Abbreviations: CL, confidence limits; NA, not applicable.
*
P=.16.