diff --git a/IRaCIS.Core.Application/Service/ReadingCalculate/IRECIST1Point1CalculateService.cs b/IRaCIS.Core.Application/Service/ReadingCalculate/IRECIST1Point1CalculateService.cs
index 0321b51b3..225b8ec65 100644
--- a/IRaCIS.Core.Application/Service/ReadingCalculate/IRECIST1Point1CalculateService.cs
+++ b/IRaCIS.Core.Application/Service/ReadingCalculate/IRECIST1Point1CalculateService.cs
@@ -1378,7 +1378,7 @@ namespace IRaCIS.Core.Application.Service.ReadingCalculate
             {
                 return string.Empty;
             }
-            var firstChangeSOD = (await _readingTaskQuestionAnswerRepository.Where(x => x.VisitTaskId == firstChangeTaskId && x.ReadingQuestionTrial.QuestionType == QuestionType.SOD).Select(x => x.Answer).FirstOrDefaultAsync()).IsNullOrEmptyReturn0();
+            var compareTaskSOD = (await _readingTaskQuestionAnswerRepository.Where(x => x.VisitTaskId == compareTaskId && x.ReadingQuestionTrial.QuestionType == QuestionType.SOD).Select(x => x.Answer).FirstOrDefaultAsync()).IsNullOrEmptyReturn0();
 
             var value = await GetSODData(inDto);
 
@@ -1386,7 +1386,7 @@ namespace IRaCIS.Core.Application.Service.ReadingCalculate
             {
                 return string.Empty;
             }
-            return (value.NullChange0() - firstChangeSOD).ToString();
+            return (value.NullChange0() - compareTaskSOD).ToString();
         }
         #endregion
 
@@ -1458,7 +1458,7 @@ namespace IRaCIS.Core.Application.Service.ReadingCalculate
                 return string.Empty;
             }
 
-            var firstChangeiSOD = (await _readingTaskQuestionAnswerRepository.Where(x => x.VisitTaskId == compareTaskId && x.ReadingQuestionTrial.QuestionType == QuestionType.ISOD).Select(x => x.Answer).FirstOrDefaultAsync()).IsNullOrEmptyReturn0();
+            var compareTaskiSOD = (await _readingTaskQuestionAnswerRepository.Where(x => x.VisitTaskId == compareTaskId && x.ReadingQuestionTrial.QuestionType == QuestionType.ISOD).Select(x => x.Answer).FirstOrDefaultAsync()).IsNullOrEmptyReturn0();
 
             var value = await GetiSODData(inDto);
 
@@ -1466,7 +1466,7 @@ namespace IRaCIS.Core.Application.Service.ReadingCalculate
             {
                 return string.Empty;
             }
-            return (value.NullChange0() - firstChangeiSOD).ToString();
+            return (value.NullChange0() - compareTaskiSOD).ToString();
         }
         #endregion