diff --git a/HealthMonitor.Service/Biz/db/TDengineService.cs b/HealthMonitor.Service/Biz/db/TDengineService.cs
index 6947bca..84db3c6 100644
--- a/HealthMonitor.Service/Biz/db/TDengineService.cs
+++ b/HealthMonitor.Service/Biz/db/TDengineService.cs
@@ -1164,8 +1164,8 @@ namespace HealthMonitor.Service.Biz.db
 
                 if (map != null)
                 {
-                    statMaxValueFprCoefficient = (float)Math.Round((decimal)map.FetalHeartRateRange![1] / res.Max(), 3);
-                    statMinValueFprCoefficient = (float)Math.Round((decimal)map.FetalHeartRateRange[0] / res.Min(), 3);
+                    statMaxValueFprCoefficient = (float)Math.Round((decimal)map.FetalHeartRateRange![1] / closestToModeData.Max(), 3);
+                    statMinValueFprCoefficient = (float)Math.Round((decimal)map.FetalHeartRateRange[0] / closestToModeData.Min(), 3);
                     StatModeAvgFprCoefficient = (float)Math.Round((decimal)map.FetalHeartRateAverage / mode, 3);
                 }
             }