diff --git a/app/controllers/stats_controller.rb b/app/controllers/stats_controller.rb
index b2e22e7cc..293e6b46e 100644
--- a/app/controllers/stats_controller.rb
+++ b/app/controllers/stats_controller.rb
@@ -42,10 +42,10 @@ class StatsController < ApplicationController
     h
   end
 
-  def cumulative_hash(association)
+  def cumulative_hash(association, date_attribute = :created_at)
     sum = 0
     association
-      .group("DATE_TRUNC('month', created_at)")
+      .group("DATE_TRUNC('month', #{date_attribute.to_s})")
       .count
       .to_a
       .sort{ |x, y| x[0] <=> y[0] }
diff --git a/spec/controllers/stats_controller_spec.rb b/spec/controllers/stats_controller_spec.rb
index 584a54cf4..6cbaf91bd 100644
--- a/spec/controllers/stats_controller_spec.rb
+++ b/spec/controllers/stats_controller_spec.rb
@@ -50,19 +50,38 @@ describe StatsController, type: :controller do
   end
 
   describe '#cumulative_hash' do
+    context "without a date attribute" do
+      before do
+        FactoryGirl.create(:procedure, :created_at => 45.days.ago)
+        FactoryGirl.create(:procedure, :created_at => 15.days.ago)
+        FactoryGirl.create(:procedure, :created_at => 15.days.ago)
+      end
+
+      let (:association) { Procedure.all }
+
+      subject { StatsController.new.send(:cumulative_hash, association) }
+
+      it { expect(subject).to eq({
+        45.days.ago.beginning_of_month => 1,
+        15.days.ago.beginning_of_month => 3
+      }) }
+    end
+  end
+
+  context "with a date attribute" do
     before do
-      FactoryGirl.create(:procedure, :created_at => 45.days.ago)
-      FactoryGirl.create(:procedure, :created_at => 15.days.ago)
-      FactoryGirl.create(:procedure, :created_at => 15.days.ago)
+      FactoryGirl.create(:procedure, :created_at => 45.days.ago, :updated_at => 20.days.ago)
+      FactoryGirl.create(:procedure, :created_at => 15.days.ago, :updated_at => 20.days.ago)
+      FactoryGirl.create(:procedure, :created_at => 15.days.ago, :updated_at => 10.days.ago)
     end
 
     let (:association) { Procedure.all }
 
-    subject { StatsController.new.send(:cumulative_hash, association) }
+    subject { StatsController.new.send(:cumulative_hash, association, :updated_at) }
 
     it { expect(subject).to eq({
-      45.days.ago.beginning_of_month => 1,
-      15.days.ago.beginning_of_month => 3
+      20.days.ago.beginning_of_month => 2,
+      10.days.ago.beginning_of_month => 3
     }) }
   end
 end