Table 4.

Mean, standard deviation, and 95% confidence interval for Poincaré plot of children with ADHD and controls

Variables	ADHD Average (SD) (CI)	Controls Average (SD) (CI)	P
SD1	29.58 (12.62) (24.69–34.48)	26.98 (12.98) (21.95–32.02)	0.333
SD2	61.64 (15.68) (55.56–67.72)	71.94 (23.66) (62.76–81.12)	0.061
SD1/SD2	0.46 (0.12) (0.41–0.51)	0.36 (0.095) (0.33–0.40)	0.002*

Note:

^*P<0.05.

Abbreviations: ADHD, attention deficit hyperactivity disorder; CI, confidence interval; SD, standard deviation; SD1, standard deviation of instantaneous beat-to-beat RR interval variability; SD2, standard deviation of continuous long-term RR interval variability.