碎片化的现状：五个数据孤岛The Fragmented Status Quo: Five Data Silos
典型三甲医院，预防相关数据分布在五个相互隔离的系统：HIS/EMR（诊断记录）、体检系统（年度数据）、可穿戴设备（连续体征）、随访系统（出院后记录）、风险评估模块（静态评分）。A typical Tier-3 hospital has prevention-related data spread across five isolated systems: HIS/EMR (diagnoses), checkup system (annual data), wearables (continuous vitals), follow-up system (post-discharge records), and risk assessment module (static scores).
这五个孤岛各自有用，但彼此无法对话。没有贯穿全程的患者健康轨迹，PSM因果归因无从进行。没有因果归因，干预效果无法被证明。没有可证明的效果，预防科室永远是成本中心。Each silo has value independently, but none can communicate with others. Without a continuous patient health trajectory, PSM attribution cannot proceed. Without attribution, intervention effects cannot be proven. Without proven effects, prevention departments remain cost centers.
闭环的含义：四个环节缺一不可What Closed-Loop Means: Four Indispensable Steps
一个真正意义上的预防医学闭环，需要四个环节彼此连通：预测（动态风险识别）→ 干预（轨迹可追踪）→ 归因（PSM因果分析）→ 结算（标准化证据报告）。A true preventive medicine closed loop requires four interconnected steps: Predict (dynamic risk identification) → Intervene (traceable trajectory) → Attribute (PSM causal analysis) → Settle (standardized evidence report).
为什么缺一不可：Why Each Step Is Indispensable:第一步的基线风险评分是第三步PSM的关键协变量；第二步的干预轨迹是第三步PSM的干预分配变量；第三步的ATT是第四步报告的核心内容。任何一步缺失，整条链路断裂。Step 1's baseline risk score is Step 3's key covariate; Step 2's intervention trajectory is Step 3's treatment assignment variable; Step 3's ATT is Step 4's core content. Remove any step and the chain breaks.
医院预防医学的困境不是缺工具，而是缺一套能把所有工具产生的数据串联成可归因因果链路的平台。闭环的价值不在于任何单一功能，而在于四环数据连通。Hospitals don't lack tools — they lack a platform that chains all tool data into an attributable causal pathway. The value of closed-loop is not any single feature, but the connectivity of all four steps.