Table 3. Relative influences of gender, hematocrit, and end-tidal PCO2 on variance components.
| Full model B |
Model B without |
||||
|---|---|---|---|---|---|
| PETCO2 | Hct | Gender | All COI | ||
| Between, σb2 | 0.01319 | 0.01332 (−0.97%) | 0.01365 (−3.38%) | 0.01361 (−3.11%) | 0.01534 (−14.01%) |
| Within, σw2 | 0.00555 | 0.00617 (−10.18%) | 0.00583 (−4.96%) | 0.00555 (−0.15%) | 0.00641 (−13.52%) |
| Total, σt2 | 0.01874 | 0.01949 (−3.89%) | 0.01949 (−3.85%) | 0.01917 (−2.25%) | 0.02175 (−13.86%) |
Abbreviations: Hct, hematocrit; PETCO2, end-tidal PCO2.
Values in parenthesis refer to change in variance estimate when the covariate of interest (COI) is included in the model. All models include scan day, measurement number, and relative background and are applied to the subsample with Hct measured.