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Figure 2 Frequency of ischemia on 48-h ambulatory electrocardiogram (AECG) by presence of criteria for ischemia induced by mental stress or bicycle exercise. Radionuclide ventriculography (RVG) wall motion criteria: 1) mental stress—new or worsened regional wall motion abnormalities during both mental stress images; 2) bicycle exercise—new or worsened regional wall motion abnormality during peak exercise image. Radionuclide ventriculography ejection fraction (EF) criteria: 1) mental stress—EF decrease >8%; 2) bicycle exercise—EF does not increase 5%. ST segment depression criterion: mental stress or bicycle exercise—1 mm ST segment depression for 1 min on AECG or 1 mm ST segment depression on 12-lead electrocardiogram. n = number with criteria present during stress test. P values <0.10 are reported, p values 0.10 are noted as pNS. Open bars = ischemia; shaded bars = no ischemia.