Table 2 Summary of methodological quality based on PEDro scale.

From: Effectiveness of interferential current therapy in patients with knee osteoarthritis: a systematic review and meta-analysis of randomized controlled trials

Studies included

PEDro scale items

PEDro score

Methodological quality

1

2

3

4

5

6

7

8

9

10

(0–10)

Quirk et al.16

Y

N

Y

N

N

N

Y

Y

Y

Y

6

Good

Adedoyin et al.17

N

N

Y

Y

N

Y

N

Y

Y

Y

6

Good

Adedoyin et al.18

Y

N

Y

N

N

Y

Y

N

Y

Y

6

Good

Defrin et al.19

Y

N

Y

N

N

N

N

N

Y

Y

4

Fair

Itoh et al.20

Y

N

Y

N

N

N

N

N

Y

Y

4

Fair

Dyson21

Y

Y

Y

N

N

Y

N

Y

Y

Y

7

Good

Atamaz et al.22

Y

Y

Y

N

N

Y

Y

Y

Y

Y

8

Good

Gundog et al.23

Y

N

Y

N

N

Y

Y

Y

Y

Y

7

Good

de Paula Gomes et al.24

Y

Y

Y

Y

N

Y

Y

Y

Y

Y

9

Excellent

Alqualo-Costa et al.25

Y

Y

Y

Y

N

Y

Y

Y

Y

Y

9

Excellent

  1. Items: 1-Random allocation; 2-Concealed allocation; 3-Baseline comparability; 4-Blinded participants; 5-Blinded therapists; 6-Blinded assessors; 7-Adequate follow-up; 8-Intention-to-treat analysis; 9-Between-group comparisons; 10-Point estimates and variability.
  2. Methodological quality: Excellent, 9–10 points; Good, 6–8 points; Fair, 4–5points; Poor, 0–3 points;
  3. Yes (Y), 1 point; No (N), 0 point.