Table 5.

Difference in Withdrawal-Related Symptoms(WRS), gaming urge, severity of IGD, and heart rate variability between short and long withdrawal groups among IGD group

	0–6 h (N = 47)	6–24 h (N = 22)
	Mean ± SD	Mean ± SD	t test
WRSa	39.98 ± 11.22	39.95 ± 13.91	0.008
Gaming cravingb	54.28 ± 7.06	49.05 ± 7.63	2.795**
Severity of IGDc	83.83 ± 10.55	80.81 ± 10.30	1.113
HRd	78.07 ± 10.77	82.68 ± 12.02	−1.573
SDNNd	66.01 ± 45.08	55.90 ± 46.20	0.848
HFd	6.03 ± 1.50	5.82 ± 1.26	0.558
LF percentd	57.99 ± 16.97	62.15 ± 18.10	−0.917
VLd	6.80 ± 1.58	6.49 ± 1.09	0.929
LFd	6.67 ± 1.22	6.66 ± 1.08	0.035
HF percentd	31.66 ± 13.51	30.19 ± 15.98	0.391
LF/HFd	0.63 ± 0.85	0.83 ± 0.94	−0.861

^a Score for Affective and Behavior Withdrawal Symptoms of Gaming Disorder Questionnaire.

^b Questionnaire on Gaming Urge-Brief Version.

^c Chen Internet Addiction Scale-Gaming Version.

^d Frequency-domain category of heart rate variability: SDNN, the standard deviation of normal-to-normal RR intervals; HF, parasympathetic activity; LF is modulated by sympathetic and parasympathetic activity; LF/HF, the balance of sympathetic and parasympathetic activity.

**P < 0.01.