diff --git a/sql/condition-glucose-grafana.sql b/sql/condition-glucose-grafana.sql
index d897299..10b9053 100644
--- a/sql/condition-glucose-grafana.sql
+++ b/sql/condition-glucose-grafana.sql
@@ -43,5 +43,9 @@ SELECT time, smoothval, absvalue,
  FROM firstorder)
  SELECT *, 
         ema(delta1st, 0.25) OVER (ORDER BY time ASC) as smoothdelta1st,
-        ema(delta2nd, 0.25) OVER (ORDER BY time ASC) as smoothdelta2nd
+        ema(delta2nd, 0.25) OVER (ORDER BY time ASC) as smoothdelta2nd,
+    STDDEV(delta1st) OVER (
+        ORDER BY time
+        RANGE BETWEEN INTERVAL '6 hours' PRECEDING AND CURRENT ROW
+    ) AS std_dev_delta1st
  FROM secondorder;