Figure 2).

Receiver operating characteristic (ROC) analysis of baseline partial pressure of arterial oxygen (PaO₂) and resting baseline saturation of peripheral oxygen (SpO₂) related to the hypoxia altitiude simulation test (HAST) outcome (n=27). (A) ROC curve of PaO₂ at ground level and HAST outcome gave an area under the curve of 0.696 (P=0.13). At a specificity of 100, PaO₂ ≤72 mmHg. (B) ROC analysis of SpO₂ at rest related to HAST outcome, gave an area under the curve of 0.402 and a SpO₂ cut-off for recommending a HAST of 95% or lower