Table 3 Pooled fixed effects (correlations) by year of publication, study design, platform, time interval between administrations, age, sample size and publication type for the 435 available correlations and 61 correlations averaged over each study/platform

 2007

12

0.854 (0.839–0.867)

128

0.835 (0.830–0.840)

 2008–2010

17

0.879 (0.868–0.890)

98

0.873 (0.869–0.877)

 2011

15

0.876 (0.864–0.888)

128

0.891 (0.886–0.896)

 2012–2013

17

0.895 (0.886–0.904)

81

0.877 (0.873–0.882)

p < 0.001

p < 0.001

 2007–2010

29

0.868 (0.859–0.876)

226

0.852 (0.849–0.856)

 2011–2013

32

0.888 (0.881–0.895)

209

0.883 (0.880–0.886)

p < 0.001

p < 0.001

 Randomized cross over

44

0.884 (0.878–0.889)

287

0.876 (0.874–0.879)

 Non–randomised cross over

3

0.825 (0.775–0.865)

22

0.825 (0.807–0.841)

 Within–patient study

14

0.858 (0.842–0.873)

126

0.828 (0.822–0.833)

p < 0.001

p < 0.001

 Randomised^a

45

0.884 (0.878–0.889)

293

0.876 (0.874–0.879)

 Not randomised

16

0.853 (0.837–0.867)

142

0.826 (0.820–0.831)

p < 0.001

p < 0.001

 Paper vs IVRS

8

0.845 (0.824–0.864)

54

0.844 (0.836–0.850)

 Paper vs PDA

10

0.851 (0.830–0.859)

69

0.851 (0.844–0.859)

 Paper vs Web/PC

34

0.886 (0.879–0.893)

197

0.863 (0.859–0.866)

 Paper vs Tablet/touch screen

7

0.890 (0.876–0.902)

91

0.877 (0.872–0.881)

 Web/PC vs IVRS

1

0.880 (0.841–0.910)

2

0.917 (0.898–0.932)

 Tablet/touch vs Web/PC

1

0.899 (0.837–0.938)

22

0.917 (0.908–0.926)

p < 0.001

p < 0.001

 0 (<1 day)

22

0.901 (0.892–0.909)

223

0.890 (0.887–0.893)

 1 (1–5 days)

13

0.891 (0.882–0.900)

83

0.877 (0.874–0.881)

 2 (6–14 days)

19

0.852 (0.840–0.864)

91

0.813 (0.805–0.819)

 3 (15+ days)

7

0.820 (0.791–0.845)

38

0.779 (0.767–0.791)

p < 0.001

p < 0.001

 0 (<1 day)

22

0.901 (0.892–0.909)

223

0.890 (0.887–0.893)

 1 (1–9 days)

26

0.881 (0.873–0.888)

148

0.862 (0.859–0.866)

 2 (10+ days)

13

0.819 (0.799–0.837)

64

0.790 (0.781–0.798)

p < 0.001

p < 0.001

 <28 years

12

0.794 (0.772–0.814)

80

0.789 (0.781–0.796)

 28–46.9 years

15

0.896 (0.888–0.904)

98

0.875 (0.871–0.878)

 47–55.9 years

12

0.889 (0.878–0.900)

103

0.877 (0.873–0.881)

 56+ years

18

0.880 (0.868–0.891)

141

0.886 (0.881–0.891)

p < 0.001

p < 0.001

 ≤56

20

0.881 (0.863–0.896)

126

0.885 (0.878–0.891)

 57–116

21

0.881 (0.870–0.891)

184

0.866 (0.862–0.870)

 >116

20

0.887 (0.870–0.884)

125

0.861 (0.858–0.864)

p = 0.817

p < 0.001

 Abstract/poster

10

0.898 (0.889–0.906)

26

0.905 (0.900–0.910)

 Full text publication

51

0.870 (0.864–0.877)

409

0.859 (0.856–0.861)

p < 0.001

p < 0.001