Table 2.

Comparison of variability indexes

	I (n = 309)	II (n = 314)	III (n = 57)
QTVI
Mean ± SD	−0.41 ± 0.58a	−1.20 ± 0.48	−1.35 ± 0.45
Median	−0.39	−1.30	−1.29
(2nd–98th)	−1.49 to 0.81	−1.89 to 0.02	−2.36 to −0.61
JTVI
Mean ± SD	−0.16 ± 0.56a	−0.94 ± 0.47	−1.06 ± 0.42
Median	−0.16	−1.02	−0.95
(2nd–98th)	−1.21 to 1.06	−1.62 to 0.24	−2.09 to −0.34
JTpVI
Mean ± SD	0.07 ± 0.64a	0.80 ± 0.56	−0.89 ± 0.45
Median	0.04	−0.91	−0.83
(2nd–98th)	−1.15 to 1.36	−1.65 to 0.65	−1.85 to 0.03
QTVN × 1000
Mean ± SD	0.46 ± 0.35a	0.21 ± 0.19	0.21 ± 0.21
Median	0.38	0.14	0.13
(2nd–98th)	0.03 to 1.38	0.03 to 0.65	0.02 to 1.05
JTVN × 1000
Mean ± SD	0.80 ± 0.61a	0.36 ± 0.32	0.38 ± 0.34
Median	0.68	0.28	0.29
(2nd–98th)	0.07 to 2.37	0.07 to 1.20	0.04 to 1.72
JTpVN × 1000
Mean ± SD	1.56 ± 1.58a	0.57 ± 0.89	0.52 ± 0.39
Median	1.14	0.34	0.44
(2nd–98th)	0.11 to 5.93	0.10 to 2.51	0.08 to 1.82
HRVN × 1000
Mean ± SD	1.46 ± 1.64a	3.61 ± 3.48	3.97 ± 3.23
Median	0.86	2.63	3.17
(2nd–98th)	0.08 to 6.42	0.17 to 13.14	0.59 to 16.40

Each value is expressed as the mean ± SD.

^a p < .05 (vs. III) with Dunnett's test.