Table 3.

Spearman correlation coefficients between actigraphic sleep measures in POTS patients and autonomic parameters. Spearman Correlation Coefficient

	SE	WASO	SOL
Max standing HR	−0.272 (P=0.10)	0.383 * (P=0.02)	0.091 (P=0.59)
Upright NE	−0.032 (P=0.86)	0.074 (P=0.67)	0.33 * (P=0.04)

POTS – Postural Tachycardia Syndrome; SE: actigraphic sleep efficiency; WASO: actigraphy determined wake after sleep onset; SOL: actigraphy determined sleep onset latency Correlation is significant at a 0.05 level (*).