Table 3 Comparison of changes in patients’ pain scores in two groups

Low back pain

Before TFA

0.00 (0.00, 0.00)

0.00 (0.00, 0.00)

0.997^a

1st hour after TFA

0.00 (0.00, 0.00)

0.00 (0.00, 0.00)

0.415^a

2nd hour after TFA

0.00 (0.00, 0.00)

0.00 (0.00, 0.00)

0.617^a

3rd hour after TFA

0.00 (0.00, 0.00)

0.00 (0.00, 0.50)

0.612^a

4th hour after TFA

0.00 (0.00, 0.00)

0.00 (0.00, 1.00)

< 0.01^a

5th hour after TFA

0.00 (0.00, 0.00)

0.00 (0.00, 2.00)

< 0.01^a

6th hour after TFA

0.00 (0.00, 0.00)

0.00 (0.00, 3.00)

< 0.01^a

7th hour after TFA

0.00 (0.00, 0.00)

1.00 (0.00, 3.00)

< 0.01^a

8th hour after TFA

0.00 (0.00, 0.00)

1.00(0.00, 4.00)

< 0.01^a

Between group (Wald χ² = 53.109, P < 0.01)^b

Wald χ² = 25.417, P < 0.01^c

Waldχ² = 91.022, P < 0.01^d

Leg pain

Before TFA

0.00 (0.00, 0.00)

0.00 (0.00, 0.00)

0.317^a

1st hour after TFA

0.00 (0.00, 0.00)

0.00 (0.00, 0.00)

0.995^a

2nd hour after TFA

0.00 (0.00, 0.00)

0.00 (0.00, 0.00)

0.314^a

3rd hour after TFA

0.00 (0.00, 0.00)

0.00 (0.00, 0.00)

0.135^a

4th hour after TFA

0.00 (0.00, 0.00)

0.00 (0.00, 0.00)

0.758^a

5th hour after TFA

0.00 (0.00, 0.00)

0.00 (0.00, 1.00)

< 0.01^a

6th hour after TFA

0.00 (0.00, 0.00)

0.00 (0.00, 2.00)

< 0.01^a

7th hour after TFA

0.00 (0.00, 0.00)

1.00 (0.00, 3.00)

< 0.01^a

8th hour after TFA

0.00 (0.00, 0.00)

1.00 (0.00, 3.00)

< 0.01^a

Between group (Wald χ² = 61.830, P < 0.01)^b

Wald χ² = 24.591, P < 0.01^c

Waldχ² = 101.073, P < 0.01^d