Table 3 Differences among three acupuncture groups

Points stimulated

Acupoints

Acupoints

Non-acupoints

Number of points

8

8

8

Depth of acupuncture (mm)

≥10

≥10

2–3

Manipulation

Y

Y

N

De qi

Y

Y

N

Electrical apparatus

Attached

Attached

Attached

Electric current

Y

N

N

Needle retention (min)

30

30

30

Number of sessions

24

24

24