title: Comparison of prescribing unit with index including both age and sex in assessing general practice prescribing costs.
abstract: OBJECTIVE
  To examine and compare the prescribing unit and a new prescribing index adjusting for age and sex in assessing general practice prescribing.
  
  
  METHODS
  Analysis of all prescriptions issued by two practices in one year. Use of data to derive a prescribing index adjusting for age and sex. Comparison of effect of prescribing unit and new index on relation between 80 practices' prescribing data and family health services authority average.
  
  
  METHODS
  Newcastle and Gateshead Family Health Services Authorities. Two urban practices with eight doctors and combined list size of 16,300 patients.
  
  
  METHODS
  Cost and number of prescriptions issued to each age and sex group. Effect of index on relation between practice data and family health services authority average.
  
  
  RESULTS
  The number of items prescribed and total costs rose with age. Although total costs were greater for women than for men, individual items cost more for men aged 25-84. Comparison of data adjusted by the prescribing unit and the new index with authority averages produced no significant differences except in a few practices with skewed age-sex demography. Results with the two indexes differed by over 5% in 34% (27/80) of practices for costs and in 14% (11/80) for items prescribed.
  
  
  CONCLUSIONS
  The age and sex profile of a practice does not explain interpractice variation in prescribing patterns. Other unidentified factors need to be considered.
authors.affiliation: Chainbridge Medical Partnership, Blaydon on Tyne.
authors.forename: I N
authors.initials: IN
authors.lastname: Purves
authors.forename: C
authors.initials: C
authors.lastname: Edwards
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D016527:Drug Costs / Q000706:statistics & numerical data; D011307:Drug Prescriptions / Q000191:economics*; D004739:England; D005194:Family Practice / Q000191:economics*; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008875:Middle Aged; D010818:Practice Patterns, Physicians' / Q000191:economics*; D055656:Prescriptions / Q000191:economics; D012737:Sex Factors; D014504:Urban Health