Table 3.

Validity of Horiba analyzer: CENTRIFUGE HORIBA versus CENTRIFUGE HPLC for sweat [Na⁺] and [K⁺].

	Sweat [Na+]	Sweat [K+]
Mean difference ± SD (mEq/L)	4.71 ± 7.87*	0.44 ± 0.52*
95% CI of mean difference (mEq/L)	3.64–5.78	0.34–0.54
ICC	0.96*	0.87*
SEE (mEq/L)	5.56	0.39
TEM (mEq/L)	5.56	0.37
CV (%)	9.37	8.36

n = 210 for sweat [Na⁺] and 116 for sweat [K⁺]. CV. coefficient of variation; CI, confidence interval; HPLC, ion chromatography using the Dionex ICS‐3000; HORIBA, Horiba B‐722 for sweat [Na⁺] and Horiba B‐731 for sweat [K⁺]; ICC, intraclass correlation coefficient (based on two‐way mixed ANOVA, absolute agreement, average measures); SD, standard deviation; SEE, standard error of the estimate; TEM, typical error of measurement; *P < 0.001.