title: Methods for implementing a medicine outlet survey: lessons from the anti-malarial market.
abstract: BACKGROUND
  In recent years an increasing number of public investments and policy changes have been made to improve the availability, affordability and quality of medicines available to consumers in developing countries, including anti-malarials. It is important to monitor the extent to which these interventions are successful in achieving their aims using quantitative data on the supply side of the market. There are a number of challenges related to studying supply, including outlet sampling, gaining provider cooperation and collecting accurate data on medicines. This paper provides guidance on key steps to address these issues when conducting a medicine outlet survey in a developing country context. While the basic principles of good survey design and implementation are important for all surveys, there are a set of specific issues that should be considered when conducting a medicine outlet survey.
  
  
  METHODS
  This paper draws on the authors' experience of designing and implementing outlet surveys, including the lessons learnt from ACTwatch outlet surveys on anti-malarial retail supply, and other key studies in the field. Key lessons and points of debate are distilled around the following areas: selecting a sample of outlets; techniques for collecting and analysing data on medicine availability, price and sales volumes; and methods for ensuring high quality data in general.
  
  
  CONCLUSIONS
  The authors first consider the inclusion criteria for outlets, contrasting comprehensive versus more focused approaches. Methods for developing a reliable sampling frame of outlets are then presented, including use of existing lists, key informants and an outlet census. Specific issues in the collection of data on medicine prices and sales volumes are discussed; and approaches for generating comparable price and sales volume data across products using the adult equivalent treatment dose (AETD) are explored. The paper concludes with advice on practical considerations, including questionnaire design, field worker training, and data collection. Survey materials developed by ACTwatch for investigating anti-malarial markets in sub-Saharan Africa and Asia provide a helpful resource for future studies in this area.
authors: Population Services International (PSI), Malaria & Child Survival Department (MCSD), Whitefield Place, Westlands, PO Box, Nairobi, 14355-00800, Kenya. koconnell@psi.org
authors: Kathryn A
authors: KA
authors: O'Connell
authors: Stephen
authors: S
authors: Poyer
authors: Tsione
authors: T
authors: Solomon
authors: Erik
authors: E
authors: Munroe
authors: Edith
authors: E
authors: Patouillard
authors: Julius
authors: J
authors: Njogu
authors: Illah
authors: I
authors: Evance
authors: Kara
authors: K
authors: Hanson
authors: Tanya
authors: T
authors: Shewchuk
authors: Catherine
authors: C
authors: Goodman
mesh_terms: D017954:Africa South of the Sahara; D000962:Antimalarials / Q000191:economics / Q000600:supply & distribution*; D001208:Asia; D003906:Developing Countries; D004363:Drug Utilization / Q000706:statistics & numerical data; D006297:Health Services Accessibility / Q000706:statistics & numerical data; D006801:Humans; D008288:Malaria / Q000188:drug therapy
chemical_list: D000962:Antimalarials
references: Malar J. 2012 Feb 08;11:37
references: 22316236
references: Bull World Health Organ. 2007 Apr;85(4):279-88
references: 17546309
references: Int J Pharm Pract. 2011 Jun;19(3):201-5
references: 21554446
references: PLoS One. 2009 Sep 02;4(9):e6857
references: 19724644
references: Soc Sci Med. 2003 Oct;57(7):1147-61
references: 12899900
references: Health Econ. 2009 Jun;18(6):727-42
references: 19301420
references: Lancet. 2009 Jan 17;373(9659):240-9
references: 19042012
references: Health Res Policy Syst. 2011 Jun 09;9:22
references: 21658259
references: Malar J. 2011 Aug 18;10:243
references: 21851625
references: Malar J. 2005 Jul 26;4:36
references: 16042815
references: Trop Med Int Health. 2004 Jun;9(6):655-63
references: 15189455
references: Malar J. 2011 Oct 31;10:325
references: 22039780
references: Malar J. 2011 Dec 13;10:352
references: 22152094
references: Lancet. 2010 Nov 27;376(9755):1869-71
references: 20940074
references: Health Policy Plan. 2005 Jul;20(4):260-3
references: 15965038
references: Malar J. 2011 Oct 31;10:326
references: 22039838
references: Trop Med Int Health. 2006 Apr;11(4):441-51
references: 16553927
references: Clin Pharmacol Ther. 2008 Nov;84(5):613-9
references: 18615006
references: BMJ. 2011 May 04;342:d2793
references: 21543403
references: Malar J. 2006 Nov 14;5:109
references: 17105662
references: Malar J. 2010 Jun 15;9:163
references: 20550653
references: Bull World Health Organ. 2010 Feb;88(2):154-8
references: 20428373