diff --git a/api/api_v1/endpoints/query.py b/api/api_v1/endpoints/query.py
index 1cfc1ba..40ea2f7 100644
--- a/api/api_v1/endpoints/query.py
+++ b/api/api_v1/endpoints/query.py
@@ -356,7 +356,7 @@ async def retention_model(request: Request,
     tmp['n_outflow'] = []
     tmp['d0'] = 0
     for rt, rd in retention_avg_dict.items():
-        tmp['d0'] = tmp['d0'] + rd['cnt0']
+        tmp['d0'] = int(df['cnt0'].sum())
         n = round(rd['cntn'] * 100 / rd['cnt0'],2)
         n = 0 if np.isnan(n) else n
         tmp['p'].append(n)