diff --git a/app/models/budget/stats.rb b/app/models/budget/stats.rb
index 24ba6fafc..541c56c3b 100644
--- a/app/models/budget/stats.rb
+++ b/app/models/budget/stats.rb
@@ -10,6 +10,10 @@ class Budget::Stats
          total_participants_web total_participants_booths]
   end
 
+  def participants
+    User.where(id: (authors + voters + balloters + poll_ballot_voters).uniq.compact)
+  end
+
   private
 
     def total_participants
@@ -52,10 +56,6 @@ class Budget::Stats
       supports(budget).count
     end
 
-    def participants
-      User.where(id: (authors + voters + balloters + poll_ballot_voters).uniq.compact)
-    end
-
     def authors
       budget.investments.pluck(:author_id)
     end
diff --git a/spec/factories/budgets.rb b/spec/factories/budgets.rb
index 9e1710cf4..0d9faa1ee 100644
--- a/spec/factories/budgets.rb
+++ b/spec/factories/budgets.rb
@@ -196,7 +196,7 @@ FactoryBot.define do
     transient { user nil }
 
     ballot do
-      association :budget_ballot, budget: investment.budget, user: user || association(:user)
+      association :budget_ballot, budget: investment.budget.reload, user: user || association(:user)
     end
   end
 
diff --git a/spec/models/budget/stats_spec.rb b/spec/models/budget/stats_spec.rb
index 247c0c40b..99044648c 100644
--- a/spec/models/budget/stats_spec.rb
+++ b/spec/models/budget/stats_spec.rb
@@ -1,206 +1,225 @@
 require "rails_helper"
 
 describe Budget::Stats do
+  let(:budget) { create(:budget) }
+  let(:stats) { Budget::Stats.new(budget) }
+  let(:investment) { create(:budget_investment, :selected, budget: budget) }
 
-  before do
-    @budget = create(:budget)
-    @heading = create(:budget_heading, budget: @budget, price: 1000)
+  describe "#participants" do
+    let(:author) { investment.author }
+    let(:author_and_voter) { create(:user) }
+    let(:voter) { create(:user) }
+    let(:voter_and_balloter) { create(:user) }
+    let(:balloter) { create(:user) }
+    let(:poll_balloter) { create(:user, :level_two) }
+    let(:non_participant) { create(:user, :level_two) }
 
-    @investment1 = create(:budget_investment, :selected, author: create(:user, gender: "female"),
-                          heading: @heading, price: 200, ballot_lines_count: 900, winner: true)
-    @investment2 = create(:budget_investment, :selected, author: create(:user, gender: "female"),
-                          heading: @heading, price: 300, ballot_lines_count: 800, winner: true)
-    @investment3 = create(:budget_investment, :selected, author: create(:user, gender: "female",
-                          date_of_birth: 40.years.ago), heading: @heading, price: 400,
-                          ballot_lines_count: 880, winner: true)
-    @investment4 = create(:budget_investment, :selected, author: create(:user, gender: "male"),
-                          heading: @heading, price: 100, ballot_lines_count: 915, winner: true)
-    @investment5 = create(:budget_investment, :unfeasible, author: create(:user, gender: "male",
-                          date_of_birth: 25.years.ago), heading: @heading)
+    before do
+      create(:budget_investment, :selected, budget: budget, author: author_and_voter)
 
-    @support1 = create(:vote, votable: @investment1, voter: create(:user, gender: "male"))
-    @support2 = create(:vote, votable: @investment2, voter: create(:user))
+      create(:vote, votable: investment, voter: author_and_voter)
+      create(:vote, votable: investment, voter: voter)
+      create(:vote, votable: investment, voter: voter_and_balloter)
 
-    @budget_ballot_line1 = create(:budget_ballot_line,
-                                  user: create(:user, gender: "female", date_of_birth: 54.years.ago),
-                                  investment: @investment1)
-    @budget_ballot_line2 = create(:budget_ballot_line, user: create(:user, gender: "female"),
-                                  investment: @investment2)
-    @budget_ballot_line3 = create(:budget_ballot_line, user: create(:user, gender: "male"),
-                                  investment: @investment3)
+      create(:budget_ballot_line, investment: investment, user: balloter)
+      create(:budget_ballot_line, investment: investment, user: voter_and_balloter)
 
-    @poll_voter = create(:poll_voter, :from_booth, budget: @budget)
+      create(:poll_voter, :from_booth, user: poll_balloter, budget: budget)
 
-    @budget_ballot4 = create(:budget_ballot, budget: @budget, physical: true, user: nil)
-    @budget_ballot_line4 = create(:budget_ballot_line, ballot: @budget_ballot4,
-                                  investment: @investment4)
-  end
-
-  let(:stats) { Budget::Stats.new(@budget).generate }
-
-  context "#total_participants" do
-
-    it "returns the number of total participants" do
-      expect(stats[:total_participants]).to be 11
+      create(:poll_voter, :from_booth, user: non_participant, budget: create(:budget))
     end
 
+    it "returns unique participants, including authors" do
+      expect(stats.participants).to match_array(
+        [author, author_and_voter, voter, voter_and_balloter, balloter, poll_balloter]
+      )
+      expect(stats.generate[:total_participants]).to be 6
+    end
   end
 
-  context "#total_participants_support_phase" do
-
+  describe "#total_participants_support_phase" do
     it "returns the number of total participants in the support phase" do
-      expect(stats[:total_participants_support_phase]).to be 2
+      2.times { create(:vote, votable: investment) }
+      create(:budget_ballot_line, investment: investment)
+
+      expect(stats.generate[:total_participants_support_phase]).to be 2
     end
 
+    it "counts a user who is voter and balloter" do
+      voter_and_balloter = create(:user)
+      create(:vote, votable: investment, voter: voter_and_balloter)
+      create(:budget_ballot_line, investment: investment, user: voter_and_balloter)
+
+      expect(stats.generate[:total_participants_support_phase]).to be 1
+    end
   end
 
-  context "#total_participants_vote_phase" do
-
+  describe "#total_participants_vote_phase" do
     it "returns the number of total participants in the votes phase" do
-      expect(stats[:total_participants_vote_phase]).to be 4
+      2.times { create(:budget_ballot_line, investment: investment) }
+      create(:vote, votable: investment)
+
+      expect(stats.generate[:total_participants_vote_phase]).to be 2
     end
 
+    it "counts a user who is voter and balloter" do
+      voter_and_balloter = create(:user)
+      create(:vote, votable: investment, voter: voter_and_balloter)
+      create(:budget_ballot_line, investment: investment, user: voter_and_balloter)
+
+      expect(stats.generate[:total_participants_vote_phase]).to be 1
+    end
   end
 
-  context "#total_participants_web" do
-
+  describe "#total_participants_web" do
     it "returns the number of total participants in the votes phase via web" do
-      expect(stats[:total_participants_web]).to be 3
-    end
+      2.times { create(:budget_ballot_line, investment: investment) }
+      create(:poll_voter, :from_booth, budget: budget)
 
+      expect(stats.generate[:total_participants_web]).to be 2
+    end
   end
 
-  context "#total_participants_booths" do
-
+  describe "#total_participants_booths" do
     it "returns the number of total participants in the votes phase in booths" do
-      expect(stats[:total_participants_booths]).to be 1
-    end
+      2.times { create(:poll_voter, :from_booth, budget: budget) }
+      create(:budget_ballot_line, investment: investment)
 
+      expect(stats.generate[:total_participants_booths]).to be 2
+    end
   end
 
-  context "#total_budget_investments" do
-
+  describe "#total_budget_investments" do
     it "returns the number of total budget investments" do
-      expect(stats[:total_budget_investments]).to be 5
-    end
+      2.times { create(:budget_investment, budget: budget) }
+      create(:budget_investment, budget: create(:budget))
 
+      expect(stats.generate[:total_budget_investments]).to be 2
+    end
   end
 
-  context "#total_votes" do
-
+  describe "#total_votes" do
     it "returns the number of total votes" do
-      expect(stats[:total_votes]).to be 4
-    end
+      create(:budget_ballot_line, investment: investment)
+      create(:budget_ballot_line, investment: create(:budget_investment, :selected, budget: budget))
 
+      expect(stats.generate[:total_votes]).to be 2
+    end
   end
 
-  context "#total_selected_investments" do
-
+  describe "#total_selected_investments" do
     it "returns the number of total selected investments" do
-      expect(stats[:total_selected_investments]).to be 4
-    end
+      3.times { create(:budget_investment, :selected, budget: budget) }
+      create(:budget_investment, :selected, budget: create(:budget))
+      create(:budget_investment, :unfeasible, budget: budget)
 
+      expect(stats.generate[:total_selected_investments]).to be 3
+    end
   end
 
-  context "#total_unfeasible_investments" do
-
+  describe "#total_unfeasible_investments" do
     it "returns the number of total unfeasible investments" do
-      expect(stats[:total_unfeasible_investments]).to be 1
-    end
+      3.times { create(:budget_investment, :unfeasible, budget: budget) }
+      create(:budget_investment, :unfeasible, budget: create(:budget))
+      create(:budget_investment, :selected, budget: budget)
 
+      expect(stats.generate[:total_unfeasible_investments]).to be 3
+    end
   end
 
-  context "#total_male_participants" do
-
-    it "returns the number of total male participants" do
-      expect(stats[:total_male_participants]).to be 4
-    end
-
-  end
-
-  context "#total_female_participants" do
-
-    it "returns the number of total female participants" do
-      expect(stats[:total_female_participants]).to be 6
-    end
-
-  end
-
-  context "#total_supports" do
-
+  describe "#total_supports" do
     it "returns the number of total supports" do
-      expect(stats[:total_supports]).to be 2
-    end
+      2.times { create(:vote, votable: investment) }
 
+      expect(stats.generate[:total_supports]).to be 2
+    end
   end
 
-  context "#total_unknown_gender_or_age" do
+  describe "Participants by gender" do
+    before do
+      3.times { create(:user, gender: "male") }
+      2.times { create(:user, gender: "female") }
+      create(:user, gender: nil)
 
-    it "returns the number of total unknown participants' gender or age" do
-      expect(stats[:total_unknown_gender_or_age]).to be 1
+      allow(stats).to receive(:participants).and_return(User.all)
     end
 
+    describe "#total_male_participants" do
+      it "returns the number of total male participants" do
+        expect(stats.generate[:total_male_participants]).to be 3
+      end
+    end
+
+    describe "#total_female_participants" do
+      it "returns the number of total female participants" do
+        expect(stats.generate[:total_female_participants]).to be 2
+      end
+    end
+
+    describe "#total_unknown_gender_or_age" do
+      it "returns the number of total unknown participants' gender or age" do
+        expect(stats.generate[:total_unknown_gender_or_age]).to be 1
+      end
+    end
+
+    describe "#male_percentage" do
+      it "returns the percentage of male participants" do
+        expect(stats.generate[:male_percentage]).to be 60.0
+      end
+    end
+
+    describe "#female_percentage" do
+      it "returns the percentage of female participants" do
+        expect(stats.generate[:female_percentage]).to be 40.0
+      end
+    end
   end
 
-  context "#participants_by_age" do
+  describe "#participants_by_age" do
+    before do
+      [21, 22, 23, 23, 34, 42, 43, 44, 50, 51].each do |age|
+        create(:user, date_of_birth: age.years.ago)
+      end
+
+      allow(stats).to receive(:participants).and_return(User.all)
+    end
 
     it "returns the age groups hash" do
-      expect(stats[:participants_by_age]["16 - 19"][:count]).to be 0
-      expect(stats[:participants_by_age]["20 - 24"][:count]).to be 7
-      expect(stats[:participants_by_age]["25 - 29"][:count]).to be 1
-      expect(stats[:participants_by_age]["30 - 34"][:count]).to be 0
-      expect(stats[:participants_by_age]["35 - 39"][:count]).to be 1
-      expect(stats[:participants_by_age]["40 - 44"][:count]).to be 1
-      expect(stats[:participants_by_age]["45 - 49"][:count]).to be 0
-      expect(stats[:participants_by_age]["50 - 54"][:count]).to be 1
-      expect(stats[:participants_by_age]["55 - 59"][:count]).to be 0
-      expect(stats[:participants_by_age]["60 - 64"][:count]).to be 0
-      expect(stats[:participants_by_age]["65 - 69"][:count]).to be 0
-      expect(stats[:participants_by_age]["70 - 74"][:count]).to be 0
+      expect(stats.generate[:participants_by_age]["16 - 19"][:count]).to be 0
+      expect(stats.generate[:participants_by_age]["20 - 24"][:count]).to be 4
+      expect(stats.generate[:participants_by_age]["25 - 29"][:count]).to be 0
+      expect(stats.generate[:participants_by_age]["30 - 34"][:count]).to be 1
+      expect(stats.generate[:participants_by_age]["35 - 39"][:count]).to be 0
+      expect(stats.generate[:participants_by_age]["40 - 44"][:count]).to be 3
+      expect(stats.generate[:participants_by_age]["45 - 49"][:count]).to be 0
+      expect(stats.generate[:participants_by_age]["50 - 54"][:count]).to be 2
+      expect(stats.generate[:participants_by_age]["55 - 59"][:count]).to be 0
+      expect(stats.generate[:participants_by_age]["60 - 64"][:count]).to be 0
+      expect(stats.generate[:participants_by_age]["65 - 69"][:count]).to be 0
+      expect(stats.generate[:participants_by_age]["70 - 74"][:count]).to be 0
     end
-
   end
 
-  context "#male_percentage" do
-
-    it "returns the percentage of male participants" do
-      expect(stats[:male_percentage]).to be 40.0
+  describe "#headings" do
+    before do
+      investment.heading.update_column(:population, 1234)
+      create(:budget_investment, heading: investment.heading)
+      2.times { create(:vote, votable: investment) }
+      create(:budget_ballot_line, investment: investment)
     end
 
-  end
-
-  context "#female_percentage" do
-
-    it "returns the percentage of female participants" do
-      expect(stats[:female_percentage]).to be 60.0
-    end
-
-  end
-
-  context "#headings" do
-
     it "returns headings data" do
-      heading_stats = stats[:headings][@heading.id]
-      expect(heading_stats[:total_investments_count]).to be 5
+      heading_stats = stats.generate[:headings][investment.heading.id]
+      expect(heading_stats[:total_investments_count]).to be 2
       expect(heading_stats[:total_participants_support_phase]).to be 2
-      expect(heading_stats[:total_participants_vote_phase]).to be 4
-      expect(heading_stats[:total_participants_all_phase]).to be 6
+      expect(heading_stats[:total_participants_vote_phase]).to be 1
+      expect(heading_stats[:total_participants_all_phase]).to be 3
       expect(heading_stats[:percentage_participants_support_phase]).to be 100.0
       expect(heading_stats[:percentage_district_population_support_phase]).to be 0.162
       expect(heading_stats[:percentage_participants_vote_phase]).to be 100.0
-      expect(heading_stats[:percentage_district_population_vote_phase]).to be 0.324
-      expect(heading_stats[:percentage_participants_all_phase]).to be 100.0
-      expect(heading_stats[:percentage_district_population_all_phase]).to be 0.486
-
-      expect(heading_stats[:total_investments_count]).to be 5
-      expect(heading_stats[:total_participants_support_phase]).to be 2
-      expect(heading_stats[:total_participants_vote_phase]).to be 4
-      expect(heading_stats[:total_participants_all_phase]).to be 6
-      expect(heading_stats[:percentage_participants_support_phase]).to be 100.0
-      expect(heading_stats[:percentage_participants_vote_phase]).to be 100.0
+      expect(heading_stats[:percentage_district_population_vote_phase]).to be 0.081
       expect(heading_stats[:percentage_participants_all_phase]).to be 100.0
+      expect(heading_stats[:percentage_district_population_all_phase]).to be 0.243
     end
-
   end
-
 end