diff --git a/CHANGES.md b/CHANGES.md
index 6738f5b29..ce8065f21 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -34,6 +34,9 @@ New tabs now open on top.
 
 ### Fixes
 
+[#1164](https://github.com/cylc/cylc-ui/pull/1164) -
+Fix the mean run time column in the table view.
+
 [#1108](https://github.com/cylc/cylc-ui/pull/1108) -
 Tree view: Task outputs are now correctly associated with the jobs that created
 them.
diff --git a/src/components/cylc/table/Table.vue b/src/components/cylc/table/Table.vue
index 7714e0b86..207ff3ccb 100644
--- a/src/components/cylc/table/Table.vue
+++ b/src/components/cylc/table/Table.vue
@@ -115,7 +115,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
                 <td>{{ ((item.latestJob || {}).node || {}).submittedTime }}</td>
                 <td>{{ ((item.latestJob || {}).node || {}).startedTime }}</td>
                 <td>{{ ((item.latestJob || {}).node || {}).finishedTime }}</td>
-                <td>{{ item.task.node.meanElapsedTime }}</td>
+                <td>{{ dtMean(item.task) }}</td>
               </tr>
             </template>
             <template v-slot:expanded-item="{ item }">
@@ -244,7 +244,7 @@ export default {
         },
         {
           text: 'dT-mean',
-          value: 'task.meanElapsedTime',
+          value: 'task.node.task.meanElapsedTime',
           sort: (a, b) => parseInt(a ?? 0) - parseInt(b ?? 0)
         }
       ],
@@ -255,6 +255,17 @@ export default {
     filteredTasks () {
       return this.tasks.filter(({ task }) => matchNode(task.node, this.tasksFilter.name, this.tasksFilter.states))
     }
+  },
+  methods: {
+    dtMean (taskNode) {
+      const ret = taskNode.node?.task?.meanElapsedTime
+      if (ret) {
+        return ret.toFixed()
+      }
+      // the meanElapsedTime can be undefined (e.g. task has not run before)
+      // return "undefined" rather than a number for these cases
+      return undefined
+    }
   }
 }
 </script>
diff --git a/tests/e2e/specs/table.cy.js b/tests/e2e/specs/table.cy.js
index 4435c76b5..11151712e 100644
--- a/tests/e2e/specs/table.cy.js
+++ b/tests/e2e/specs/table.cy.js
@@ -116,5 +116,29 @@ describe('Table view', () => {
         .contains('eventually')
         .should('be.visible')
     })
+    it('displays and sorts dt-mean', () => {
+      cy.visit('/#/table/one')
+
+      cy
+        // sort dt-mean ascending
+        .get('[aria-label="dT-mean: Not sorted. Activate to sort ascending."] > :nth-child(1)')
+        .click()
+
+        // check 0 is at the top (1st row, 10th column)
+        .get('tbody > :nth-child(1) > :nth-child(10)')
+        .should(($ele) => {
+          expect($ele.text().trim()).equal('') // no value sorted first
+        })
+
+        // sort ft-mean descending
+        .get('.asc > .v-icon > .v-icon__svg > path')
+        .click()
+
+        // check 7 is at the top (1st row, 10th column)
+        .get('tbody > :nth-child(1) > :nth-child(10)')
+        .should(($ele) => {
+          expect($ele.text().trim()).equal('7')
+        })
+    })
   })
 })