Table 2.

Urinary excretion (nmol/12-h/BSA m²) of catecholamines and free metanephrines during on and off duty, nighttime, and daytime.

	Off duty	On duty	P-value
Epinephrine nighttime	3.7 [2.2–8.2]	11.9 [7.2–23]	0.001
Epinephrine daytime	10.1 [8.0–15.1]	20.1 [15.7–26.8]	0.002
Norepinephrine nighttime	24.7 [19.6–30.4]	39.9 [23.7–63.6]	0.026
Norepinephrine daytime	45.5 [33.8–58.4]	40.6 [33.0–60.4]	1.000
Metanephrine nighttime	27.8 [20.6–38.4]	38.0 [27.7–56.0]	0.038
Metanephrine daytime	29.8 [26.6–44.3]	37.2 [29.5–45.0]	0.982
Normetanephrine nighttime	23.4 [19.8–28.1]	39.6 [22.5–54.6]	0.006
Normetanephrine daytime	34.3 [27.0–45.7]	36.0 [27.2–52.7]	1.000

Results are shown as medians and interquartiles. P-values derived from paired Wilcoxon signed rank sum test with Bonferroni correction for multiple testing (number of tests = 4)..