. 2012 Nov 22;18(1):41–50. doi: 10.1111/anec.12019

Table 3.

Pearson's Correlation Coefficient in the Three Subgroups of Patients and in the Whole Population, Computed between each Parameter and AFR

Parameter	All patients	Rhythm‐control drug	Rate‐control drug	No antiarrhythmic drugs
HR	0.05	0.08	–0.16	0.10
SDNN	0.15	0.28	–0.09	0.38
pNN20	0.13	0.10	0.10	0.57^a
pNN50	0.12	0.06	0.12	0.56^a
pNN80	0.13	0.05	0.14	0.52
rMSSD	0.17	0.24	0.16	0.42
ApEn	0.26^a	0.39	0.18	0.46
R	–0.33^a	–0.60^a	–0.27^a	–0.56^a

AFR = atrial fibrillation rate; HR = ventricular rate; SDNN = standard deviation of all normal RR intervals; rMSSD = the root of the mean squared differences of successive RR intervals; pNN20, pNN50, pNN80 = the percentage of interval differences of successive RR intervals greater than 20ms, 50ms and 80ms; ApEn = approximate entropy; R = regularity index.

P < 0.05.