Table 4.

Effect of acupuncture treatment on the level of NAA/Cr adjusting for age, sex, brain region, and headache history for each subject group

Group	Co-variables	B	Std. error	95% CI	Beta	T	p-value
Migraine without aura	Treatment (post vs. pre)	0.16	0.05	0.06–0.26	0.33	3.28	0.002
	Age (year)	–0.02	0.01	–0.04– –0.01	–0.93	–3.24	0.002
	Sex (female vs. male)	–0.05	0.06	–0.16–0.06	–0.10	–0.96	0.343
	Location (left vs. right)	0.11	0.05	0.01–0.21	0.21	2.13	0.038
	Headache history (year)	0.01	0.01	–0.00–0.02	0.42	1.48	0.144
Cervicogenic headache	Treatment (post vs. pre)	–0.05	0.05	–0.15–0.04	–0.13	–1.15	0.255
	Age (year)	–0.01	0.00	–0.02– –0.00	–0.47	–3.62	0.001
	Sex (female vs. male)	–0.13	0.05	–0.23– –0.02	–0.28	–2.32	0.024
	Location (left vs. right)	0.10	0.05	0.00–0.19	0.23	2.08	0.042
	Headache history (year)	–0.01	0.01	–0.03–0.02	–0.06	–0.51	0.615
Healthy control	Treatment (post vs. pre)	–0.04	0.07	–0.19–0.10	–0.06	–0.59	0.559
	Age (year)	–0.16	0.04	–0.24– –0.09	–0.52	–4.37	0.000
	Sex (female vs. male)	–0.06	0.09	–0.24–0.11	–0.08	–0.72	0.478
	Location (left vs. right)	0.20	0.07	0.06–0.35	0.30	2.77	0.008
	Headache history (year)	NA

Note: B represents the correlation coefficient.

Abbreviation: NA, not applicable.