Table 6 Subgroup interactions for meta-analysis of interventions

# of studies

SMD

LL

UL

p-value

3

0.23

−0.41

0.88

0.8

4

0.37

−0.45

1.19

7

0.29

−0.22

0.8

1

0.57

0.17

0.97

0.65

5

0.37

-0.44

1.17

2

0.51

0.14

0.88

0.85

4

0.41

-0.52

1.34

4

0.69

0.14

1.25

0.33

1

0.16

-0.76

1.09

4

0.12

-0.65

0.89

0.25

3

0.64

0.22

1.06

Enhanced consent form vs. control

# of studies

SMD

LL

UL

p-value

3

2.33

0.01

4.66

0.49

8

1.47

0.7

2.23

7

2.6

1.33

3.88

0.01

2

0.33

-0.43

1.09

4

2.56

0.69

4.44

0.59

5

1.94

0.66

3.23

3

0.57

-0.06

1.19

0.01

8

2.23

1.19

3.28

Extended discussion vs. control

# of studies

SMD

LL

UL

p-value

3

1.31

0.33

2.29

0.19

1

0.63

0.33

0.93

2

1.33

-0.07

2.74

0.53

2

0.83

0.19

1.47

1

2.06

1.61

2.52

0.01

3

0.66

0.39

0.93