Comparison 11. acupuncture versus acupuncture. (unknown / mixed duration of low back pain).

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 pain (lower values are better)	1		Mean Difference (IV, Random, 95% CI)	Totals not selected
1.1 Short term (immediately after end of sessions)	1		Mean Difference (IV, Random, 95% CI)	0.0 [0.0, 0.0]
2 pain recovery (higher values are better)	1		Mean Difference (IV, Random, 95% CI)	Totals not selected
2.1 Immediately after the end of the sessions	1		Mean Difference (IV, Random, 95% CI)	0.0 [0.0, 0.0]
3 global measure (higher values are better)	1		Risk Ratio (M‐H, Random, 95% CI)	Totals not selected
3.1 Short‐term follow‐up (up to 3 months after the end of the sessions)	1		Risk Ratio (M‐H, Random, 95% CI)	0.0 [0.0, 0.0]
4 functional status (higher values are better)	1		Mean Difference (IV, Random, 95% CI)	Totals not selected
4.1 Immediately after the end of the sessions	1		Mean Difference (IV, Random, 95% CI)	0.0 [0.0, 0.0]
5 physical examination (finger‐floor distance) Higher values are better.	1		Mean Difference (IV, Random, 95% CI)	Totals not selected
5.1 Immediately after the end of the sessions	1		Mean Difference (IV, Random, 95% CI)	0.0 [0.0, 0.0]
6 improvement			Other data	No numeric data
6.1 Long‐term follow‐up (more than 1 year)			Other data	No numeric data