Table 2. End-tidal PO2 statistics for normal air and 4% CO2 baseline conditions (in units of mm Hg).
| Subject |
Normal air condition |
4% CO2 condition |
||||
|---|---|---|---|---|---|---|
| Baseline | CDB | BH | Baseline | CDB | BH | |
| PETO2 (mm Hg) | ΔPETO2 (mm Hg) | ΔPETO2 (mm Hg) | PETO2 (mm Hg) | ΔPETO2 (mm Hg) | ΔPETO2 (mm Hg) | |
| 1 | 114.6±1.7 | 6.1±5.5 | −13.1±2.9 | 129.4±1.7 | 4.9±1.3 | −10.6±3.1 |
| 2 | 122.8±4.6 | 12.6±2.6 | −15.4±0.2 | 127.1±1.5 | 8.2±1.0 | −9.5±4.9 |
| 3 | 108.6±4.3 | 16.6±7.5 | −10.3±8.1 | 124.4±1.9 | 7.5±1.2 | −18.2±6.9 |
| 5 | 101.8±6.9 | 24.7±2.3 | −16.9±1.5 | 127.2±4.3 | 14.1±4.0 | −14.3±2.6 |
| 6 | 112.1±2.2 | 14.7±2.7 | −17.3±3.7 | 129.3±2.4 | 6.1±1.3 | −13.7±6.1 |
| 7 | 117.8±1.8 | 12.1±1.1 | −19.8±0.4 | 130.5±2.6 | 4.5±1.4 | −16.4±4.6 |
| 8 | 106.2±6.4 | 17.9±6.2 | −18.1±5.2 | 118.8±2.1 | 11.6±0.4 | −15.4±1.6 |
| 9 | 113.3±4.0 | 15.1±4.6 | −19.3±2.5 | 131.9±1.5 | 3.7±0.9 | −17.7±5.9 |
| 10 | 118.0±9.8 | 8.8±5.0 | −27.4±7.9 | 123.8±1.9 | 8.7±1.1 | −29.9±3.3 |
| 11 | 120.9±2.4 | 9.8±1.2 | −10.7±0.9 | 123.3±1.1 | 4.6±1.5 | −14.0±0.7 |
| 12 | 113.7±1.7 | 7.2±4.5 | −18.3±4.9 | 126.3±1.5 | 7.2±2.8 | −16.6±4.5 |
| Mean±s.d. | 113.6±6.3 | 13.2±5.4 | −15.5±6.7 | 126.5±3.8† | 7.4±3.2† | −14.7±6.9 |
BH, breath hold; CDB, cued deep breathing; PET, end-tidal partial pressure.
†Significant difference across two baseline conditions, paired Student's t-test P<0.005.