diff --git a/app/services/csv/sales_log_csv_service.rb b/app/services/csv/sales_log_csv_service.rb
index 57f48c126..fbbd69625 100644
--- a/app/services/csv/sales_log_csv_service.rb
+++ b/app/services/csv/sales_log_csv_service.rb
@@ -48,6 +48,15 @@ module Csv
       },
     }.freeze
 
+    PERSON_DETAILS = {}.tap { |hash|
+      (2..6).each do |i|
+        hash["age#{i}_known"] = { "refused_code" => "-9", "refused_label" => "Not known", "details_known_field" => "details_known_#{i}" }
+        hash["sex#{i}"] = { "refused_code" => "R", "refused_label" => "Prefers not to say", "details_known_field" => "details_known_#{i}" }
+        hash["relat#{i}"] = { "refused_code" => "R", "refused_label" => "Prefers not to say", "details_known_field" => "details_known_#{i}" }
+        hash["ecstat#{i}"] = { "refused_code" => "10", "refused_label" => "Prefers not to say", "details_known_field" => "details_known_#{i}" }
+      end
+    }.freeze
+
     FIELDS_ALWAYS_EXPORTED_AS_CODES = %w[
       la
       prevloc
@@ -75,6 +84,13 @@ module Csv
         get_label(value, attribute, log)
       elsif DATE_FIELDS.include? attribute
         log.send(attribute)&.iso8601
+      elsif PERSON_DETAILS.any? { |key, _value| key == attribute } && person_details_not_known?(log, attribute)
+        case @export_type
+        when "codes"
+          PERSON_DETAILS.find { |key, _value| key == attribute }[1]["refused_code"]
+        when "labels"
+          PERSON_DETAILS.find { |key, _value| key == attribute }[1]["refused_label"]
+        end
       else
         value = log.public_send(attribute)
         case @export_type
@@ -125,5 +141,10 @@ module Csv
       non_question_fields = %w[id status created_at updated_at old_form_id collection_start_year creation_method is_dpo]
       non_question_fields + attributes
     end
+
+    def person_details_not_known?(log, attribute)
+      details_known_field = PERSON_DETAILS.find { |key, _value| key == attribute }[1]["details_known_field"]
+      log[details_known_field] == 1
+    end
   end
 end