Outcome title (End of treatment)	Number of study arms /patients	SMD (95% CI); P value	Hetero‐ geneity I2 [%]
< 5 sessions
Pain Negative mood Disability	1/28 no data 1/28	0.06 (‐0.69 to  0.80) no data ‐0.24 (‐0.99 to  0.50)
5‐25 sessions
Pain Negative mood Disability	12/855 13/1190 9/722	‐0.22(‐0.45 to 0.01); 0.07 ‐0.20(‐0.32 to ‐0.09); 0.0006 ‐0.26(‐0.45 to ‐0.07); 0.008	60 0 33
> 25 sessions
Pain Negative mood Disability	7/376 6/341 5/290	‐0.37 (‐0.80 to 0.06); 0.09 ‐0.72 (‐1.08 to ‐0.36); < 0.0001 ‐0.40 (‐1.18 to 0.38); 0.32	75 59 89