Fig. 7
Funnel plots for small-study effects with confidence levels of 90% (white), 95% (dark grey) and 99% (light grey): A Intraclass Correlation Coefficient (ICC); B: Mean Difference (MD); C: Typical Error of measurement (TE); and (D): Correlation Coefficient (r). Egger’s regression test: A F = 0.00, p = 0.95; B F = 0.03, p = 0.87; C F = 0.14, p = 0.73; and D F = 0.01, p = 0.91. Begg’s rank correlation test: A Kendall's tau = 0.11, p = 0.25; B Kendall's tau = − 0.05, p = 0.54; C Kendall’s tau = − 0.10, p = 0.29; and D Kendall's tau = − 0.05, p = 0.57