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Table 1 Clinical characteristics of subjects without pheochromocytoma from the derivation set

From: Measurement of fractionated plasma metanephrines for exclusion of pheochromocytoma: Can specificity be improved by adjustment for age?

Clinical characteristic

True negative Measurements of fractionated plasma metanephrines (n = 264)

False positive Measurements of fractionated plasma metanephrines (n = 46)

Significance testing results

Gender (females/n)

142/264

26/46

P = 0.73 (χ2 = 0.12, df = 1)

Age (mean, SD years)

50.7 (15.03)

57.3 (14.6)

P = 0.007 (t = 2.81, df = 63)

Systolic blood pressure (mean, SD mmHg)

147 (26) (n = 260)

153 (32)

P = 0.24 (t = 1.19, df = 56)

Diastolic blood pressure (mean, SD mmHg)

87 (12) (n = 260)

89 (15)

P = 0.39 (t = 0.87, df = 57)

Number of antihypertensive agents currently used (mean, SD)

1.4 (1.5)

1.6 (1.3)

P = 0.28 (t = 1.09, df = 70)

Known diagnosis of obstructive sleep apnea

15/264

4/46

P = 0.43 (χ2 = 0.62, df = 1)