Studies

VR^a Mean (S.D.)

Control Mean (S.D.)

Mean difference (95% CI)

Wiet 2009 [22]

23 (8.6)

17 (8.5)

6.00 (−3.68 to 15.68)

Wiet 2012 [23]

2.2 (0.54)

2.14 (0.56)

0.06 (−0.21 to 0.33)