study estimate ci_lower ci_upper weight
Smith 2019 0.50 0.10 0.90 5.2
Johnson 2020 -0.30 -0.80 0.20 3.8
Williams 2020 0.20 -0.10 0.50 8.1
Brown 2021 0.65 0.30 1.00 6.0
Davis 2021 -0.10 -0.50 0.30 4.5
Miller 2022 0.35 0.05 0.65 7.3
Wilson 2022 0.80 0.40 1.20 3.2
Moore 2023 0.15 -0.20 0.50 9.0
Overall 0.28 0.10 0.46 10.0