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Table 2 Level of evidence

From: Acupuncture in improving endometrial receptivity: a systematic review and meta-analysis

Variable

Effect(RR/MD/SMD)

95%CI

P

I2(%)

P(X2 test)

Statistical Method

Studies (N)

Sample size (N)

Level of evidence

Pregnancy rate

1.23

1.13, 1.34

< 0.00001

30

0.16

Fixed effects models

11

2909

Very low

Endometrial pattern

1.47

1.27, 1.70

< 0.00001

18

0.30

Fixed effects models

6

552

Moderate

Endometrial thickness

0.41

0.11, 0.72

0.008

72

0.0004

Random effects models

9

666

Low

Electroacupuncture

0.83

0.22, 1.43

0.008

83

0.003

Random effects models

3

298

Low

Acupuncture

0.20

−0.01, 0.40

0.06

0

0.56

Random effects models

6

368

Moderate

Embryo transfer rate

2.04

1.13, 3.70

0.02

0

0.85

Fixed effects models

2

124

Very low

RI

−0.08

− 0.15, − 0.02

0.01

99

< 0.00001

Random effects models

5

437

Very low

With moxibustion

−0.01

− 0.02, − 0.00

0.0006

0

0.90

Random effects models

2

154

Low

Without moxibustion

−0.15

− 0.28, − 0.01

0.03

99

< 0.00001

Random effects models

3

283

Very low

PI

−2.39

−3.85, −0.93

0.001

97

< 0.00001

Random effects models

5

437

Very low

With moxibustion

−0.54

−0.86, − 0.22

0.0010

0

0.60

Random effects models

2

154

Low

Without moxibustion

−3.69

−5.93, −1.45

0.001

97

< 0.00001

Random effects models

3

283

Very low

S/D

−0.60

−0.89, − 0.30

< 0.0001

15

0.28

Fixed effects models

2

187

Low