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@@ -416,6 +416,19 @@ Wilcoxon signed-rank (non-parametric) 结果一致:
 
 E/T偏高可解释为: retrieval方法surface更多specific preferences，导致user给出更targeted feedback。
 
+### E/T分解分析
+
+| 因素 | reflection | rag_vector | diff | 对E/T贡献 |
+|------|-----------|-----------|------|----------|
+| Enforcements/session | 1.47 | 1.54 | +0.07 (+4.8%) | **79%** |
+| Turns/session | 8.41 | 8.31 | -0.10 (-1.2%) | 20% |
+| E/T | 0.175 | 0.185 | +0.011 (+6.0%) | |
+
+- Enforcements差异 marginally significant (p=0.058)，turns差异不显著 (p=0.19)
+- E/T偏高79%来自enforcements略多，20%来自turns略少
+- rag_vector用更少turns完成任务 → 整体交互效率更高
+- **报告说法**: E/T差异不显著，而rag_vector用更少turns和更低user effort完成任务，说明整体交互效率更高
+
 ---
 
 ## 后续计划