A comparison of interferential current efficacy in elderly intervertebral disc degeneration patients with or without sarcopenia: a retrospective study

Table 2 Index and comparison of IDD patients with sarcopenia and IDD without sarcopenia before and after IFC therapy (x ± s)

	IWS group (before)	IWS group (after)	IWOS group (before)	IWOS group (after)	P	ES	P	ES	P	ES
	IWS group (before)	IWS group (after)	IWOS group (before)	IWOS group (after)	IWS(before) vs IWOS(before)		IWS(before) vs IWS(after)		IWOS(before) vs IWOS(after)
Number of cases	34	34	86	86
Grip strength	17.33 ± 3.36	23.64 ± 4.42	27.80 ± 2.82	28.56 ± 2.72			0.000	1.607	0.003	0.274
GS	0.88 ± 0.08	1.06 ± 0.10	1.21 ± 0.15	1.37 ± 0.12			0.000	1.988	0.000	1.178
SMI	5.89 ± 0.68	6.38 ± 0.86	7.22 ± 0.83	7.57 ± 0.58			0.002	0.632	0.000	0.489
SARC-F	5.50 ± 1.24	3.50 ± 1.11	2.44 ± 1.01	2.34 ± 0.97			0.000	1.700	0.479	0.101
SCSA	53.53 ± 14.39	54.24 ± 16.02	60.40 ± 15.24	62.33 ± 14.85	0.000	0.463	0.591	0.047	0.124	0.128
DFF	13.56 ± 2.86	13.35 ± 2.82	13.00 ± 2.01	12.77 ± 2.15	0.000	0.227	0.332	0.074	0.161	0.111
VAS	7.38 ± 1.10	2.79 ± 1.59	6.09 ± 1.81	1.24 ± 0.91	0.000	0.861	0.000	3.357	0.000	3.386
ODI	20.44 ± 3.49	14.32 ± 2.43	13.55 ± 3.06	11.88 ± 2.53	0.000	2.099	0.000	2.035	0.000	0.595
NVC	41.34 ± 3.52	42.86 ± 4.81	45.10 ± 4.83	45.77 ± 4.21	0.001	0.890	0.153	0.361	0.281	0.148

All the comparisons were performed between two groups, the detailed information was indicated in the table (two-tailed, Student’s t test), *P < 0.0125, statistically significant differences (Bonferroni Correction, α_adjusted = α/n, α = 0.05, n = 4). Effect size was presented by Cohen’s d. Cohen’s d: 0–0.2 small; 0.3–0.5 moderate; ≥ 0.6 large
GS Gait speed, SMI Skeletal muscle index, SARC-F S (Strength), A (Assistance in walking), R (Rise from a chair), C (Climb stairs), F (Falls), SCSA Standard cross-sectional area, DFF Degree of fatty infiltration, VAS Visual analogue scale, ODI Oswestry dysfunction index, NCV Nerve conduction velocity, IDD Intervertebral disc degeneration, IFC Interferential current, IWS Intervertebral disc degeneration patients with sarcopenia, IWOS Intervertebral disc degeneration patients without sarcopenia, ES Effect size

ISSN: 1471-2474