Table 4.

Results of meta-regression analysis

Model variables	Coefficients	Standard errors	95% CI lower	95% CI upper	P values
year	− 0.021	0.063	− 0.195	0.154	0.759
Is RCT	− 0.710	0.411	− 1.852	0.431	0.159
Study Length	0.189	0.220	− 0.421	0.800	0.437
Duration	− 0.002	0.001	− 0.004	0.000	0.047
Treatment Length	− 0.037	0.002	− 0.090	0.017	0.130
Age	0.018	0.037	− 0.085	0.121	0.652
_cons	42.674	127.321	− 310.826	396.175	0.754