title: Comparison of a digital ovulation test with three popular line ovulation tests to investigate user accuracy and certainty.
abstract: OBJECTIVE
  To determine the accuracy and certainty with which volunteers interpreted results of a digital ovulation test, Clearblue digital ovulation test (CB-DOT), compared with three home use non-digital visual ovulation tests: Clearblue ovulation test (CB-OT), First Response (FR) and Answer (AN).
  
  
  METHODS
  A total of 72 female volunteers aged 18 - 45 years interpreted test results from each of the four ovulation tests to determine the day of the luteinising hormone surge in 40 individual menstrual cycles. We used urine previously collected from 25 volunteers. The accuracy with which volunteers interpreted the test results was calculated by comparing their results with results obtained by trained technicians using a blinded test regime. For each of the four tests, volunteers were also asked to rate seven attributes of certainty and eight attributes of preference. The primary objective was to compare the accuracy with which volunteers read results from CB-DOT when compared to three visual-based line ovulation tests.
  
  
  RESULTS
  A significantly higher percentage of volunteers/technicians agreed on the interpretation of the results from CB-DOT (97.3%) than for CB-OT (83.5%; p = 0.0153), AN (73%; p = 0.0011) or FR (64.3%; p = 0.0001). CB-DOT was also found to have significantly better Likert scores than CB-OT, FR and AN for all seven attributes of certainty and was the test that 97.2% of volunteers preferred.
  
  
  CONCLUSIONS
  Women can misread the results of line ovulation tests. Over 97% of volunteers correctly read the result of CB-DOT. CB-DOT was also the test that women read with most certainty and the test that most users preferred.
authors.affiliation: SPD Development Company Limited, Priory Business Park, Bedford, MK44 3UP , UK +44 0 1234 835 486 ; +44 0 1234 835 006 ; sarah.johnson@spdspark.com.
authors.forename: Sarah
authors.initials: S
authors.lastname: Johnson
authors.forename: Jayne
authors.initials: J
authors.lastname: Ellis
authors.forename: Sonya
authors.initials: S
authors.lastname: Godbert
authors.forename: Sharon
authors.initials: S
authors.lastname: Ali
authors.forename: Michael
authors.initials: M
authors.lastname: Zinaman