Comparison 7.

Ergonomic training versus no intervention

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Neck/shoulder musculoskeletal symptoms by medical examination	1	499	Risk Ratio (M‐H, Fixed, 95% CI)	1.19 [0.66, 2.14]
2 Hand/wrist symptoms by medical examination	1	509	Risk Ratio (M‐H, Fixed, 95% CI)	1.39 [0.41, 4.74]
3 Intensity of upper extremity pain	1	82	Mean Difference (IV, Fixed, 95% CI)	0.08 [‐0.22, 0.38]
4 Frequency of upper extremity pain	1	82	Mean Difference (IV, Fixed, 95% CI)	‐0.03 [‐0.45, 0.39]
5 Duration of upper extremity pain	1	82	Mean Difference (IV, Fixed, 95% CI)	0.13 [‐0.25, 0.51]