TABLE 3.

Correlations between Tp‐e values and HRV values/age

Variables	Group 1 (30‐39 y)	Group 2 (40‐49 y)	Group 3 (50‐59 y)	Group 4 (60‐69 y)	Group 5 (70‐79 y)
Tp‐e/age
R‐value	.76	.77	.79	.81	.82
P‐value	<.0025	<.0025	<.0025	<.0025	<.0025
Correlation	Strong positive	Strong positive	Strong positive	Strong positive	Strong positive
Tp‐e/HR
R‐value	−.74	−.72	−.78	−.81	−.79
P‐value	<.0025	<.0025	<.0025	<.0025	<.0025
Correlation	Moderate negative	Moderate negative	Strong negative	Strong negative	Strong negative
Tp‐e/SDNN 24‐hour
F‐value	−.67	−.56	−.71	−.61	−.74
P‐value	<.0025	<.0025	<.0025	<.0025	<.0025
Correlation	Moderate negative	Moderate negative	Moderate negative	Moderate negative	Moderate negative
Tp‐e/SDANN index
F‐value	−.46	−.51	−.53	−.48	−.52
P‐value	<.0025	<.0025	<.0025	<.0025	<.0025
Correlation	Weak negative	Moderate negative	Moderate negative	Weak negative	Moderate negative
Tp‐e/RMSSD
F‐value	−.55	−.49	−.51	−.48	−.52
P‐value	<.0025	<.0025	<.0025	<.0025	<.0025
Correlation	Moderate negative	Weak negative	Moderate negative	Moderate negative	Moderate negative
Tp‐e/sNN50
F‐value	−.43	−.42	−.47	−.42	−.55
P‐value	<.0025	<.0025	<.0025	<.0025	<.0025
Correlation	Weak negative	Weak negative	Weak negative	Weak negative	Moderate negative
Tp‐e/pNN50
F‐value	−.39	−.41	−.36	−.38	−.39
P‐value	<.0025	<.0025	<.0025	<.0025	<.0025
Correlation	Weak negative	Weak negative	Weak negative	Weak negative	Weak negative

Abbreviations: Tp‐e, T peak‐end interval; NN, successive RR interval; SDNN 24‐Hour, Standard Deviation of all NN intervals; SDANN Index, Standard deviation of the average NN intervals for each 5 min segment of a 24 h heart rate variability recording; SDNN Index, Mean of the standard deviations of all the NN intervals for each 5 min segment of a 24 h heart rate variability recording; RMSSD, Root mean square of successive RR interval differences; pNN50, Percentage of successive RR intervals that differ by more than 50 ms; sNN50, The number of successive RR intervals that differ by more than 50 ms.