Comparison 6.

Reduce work hours versus normal work hours

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Upper extremity disorder (6 months)	1	102	Mean Difference (IV, Fixed, 95% CI)	0.08 [‐0.32, 0.48]
2 Upper extremity disorder (12 months)	1	102	Mean Difference (IV, Random, 95% CI)	0.22 [‐0.22, 0.66]
3 Work ability (6 months)	1	104	Mean Difference (IV, Fixed, 95% CI)	0.41 [‐0.28, 1.10]
4 Work ability (12 months)	1	104	Mean Difference (IV, Fixed, 95% CI)	0.5 [‐0.23, 1.23]