title: Measurement of headache frequency, intensity and duration: comparison of patient report by questionnaire and headache diary.
abstract: OBJECTIVE
  The efficacy of interventions for headache is often based on patient estimates of the headache parameters of frequency, intensity and duration, which can be ascertained from interview, by questionnaire or from a headache diary. The aim of the present study was to test the accuracy of retrospective patient reports of headache frequency, intensity and duration, with respect to measures derived from a daily headache diary.
  
  
  METHODS
  Forty participants suffering from least one headache per month completed a daily headache diary for four weeks. At the end of the four-week period participants completed a questionnaire requiring them to estimate the frequency, usual duration and usual intensity of their headaches. Spearman rank correlation coefficients were calculated to determine the relationship between diary and questionnaire data.
  
  
  RESULTS
  Correlation coefficients (Spearman's rho) for questionnaire and diary data for headache frequency and duration were 0.80 and 0.72, respectively, whereas that for intensity was 0.51.
  
  
  CONCLUSIONS
  The findings suggest that when compared with the use of a headache diary, patient estimations of headache frequency and duration by questionnaire are reasonably accurate. Headache intensity appears to be more difficult to remember and report, possibly because of the multidimensional nature of pain, as opposed to the temporal characteristics of frequency and duration. It is recommended that frequency and duration be preferred over intensity as outcome measures if questionnaires or retrospective reports are used.
authors.affiliation: Musculoskeletal Research Centre, School of Physiotherapy, La Trobe University, Australia. k.niere@latrobe.edu.au
authors.forename: Kennneth
authors.initials: K
authors.lastname: Niere
authors.forename: Ana
authors.initials: A
authors.lastname: Jerak
mesh_terms: D000328:Adult; D001315:Australia; D002986:Clinical Trials as Topic; D003625:Data Collection / Q000379:methods*; D005260:Female; D006261:Headache; D006801:Humans; D008297:Male; D008499:Medical Records; D011939:Mental Recall; D008875:Middle Aged; D018709:Statistics, Nonparametric; D011795:Surveys and Questionnaires