marginally significantP =.09
The test for subgroup differences in functional independence suggested a marginally significant variation in effects ( χ 1 2 =2.93; P =.09), indicating that intervention duration may be a potential contributor to the overall heterogeneity of the meta-analysis, albeit not reaching formal statistical significance, while the point estimate still favored shorter intervention duration (SMD 0.67, 95% CI 0.12-1.23; I 2=0%; P= .72; Figure 8 ).