Agreement between self‐reported antihypertensive drug use and pharmacy records in a population‐based study in The Netherlands
- 108 Downloads
From 1987 to 1991, over 36,000 men and women aged 20‐59 years have been examined in the Monitoring Project on Cardiovascular Disease Risk Factors in The Netherlands. Classification of the treatment status of hypertensives in this population‐based study was based on self‐administered questionnaires. In order to assess the accuracy of self‐reported antihypertensive drug use we compared the questionnaire information with computerized pharmacy records from a sample of 372 hypertensive subjects. Most antihypertensive drugs that were mentioned in the questionnaire were present in the pharmacy medication history (93%). However, this percentage was less (76%) when a comparison was made with the calculated duration of use based on the number of units prescribed and the directions for use in the pharmacy records. About 94% of the hypertensive subjects who were using an antihypertensive drug according to the pharmacy records, also mentioned at least one antihypertensive drug in the questionnaire. Agreement between self‐reported antihypertensive drug use and pharmacy records was consistently high for all classes of antihypertensive drugs. Among 321 (86%) subjects, the number and types of self‐reported antihypertensive drugs were exactly the same as in the pharmacy records. In conclusion, the agreement between self‐reported antihypertensive drug use and pharmacy records was high, and the self‐reported questionnaire information on antihypertensive drug use can be reliably used for the classification of treatment status of hypertensive subjects in this population‐based study.
Unable to display preview. Download preview PDF.
- 2.Project TWM. Geographical variation in the major risk factors of coronary heart disease in men and women aged 35-64 years. Wld Hlth Statist Quart 1988;41:115-39.Google Scholar
- 3.Verschuren WMM, Leer van EM, Blokstra A, et al. Cardiovascular disease risk factors in The Netherlands. Neth J Cardiol 1993;6:205-10.Google Scholar
- 6.Paganini-Hill A, Ross RK. Reliability of recall of drug usage and other health-related information. A J Epidemiol 1982;116: 114-22.Google Scholar
- 8.West SL, Savitz DA, Koch G, Strom BL, Huess HA, Hartzema A. Recall accuracy for prescription medications: Self-report compared with database information. A J Epidemiol 1995;142:1103-12.Google Scholar
- 12.Schwarz A, Faber U, Borner K, Keller F, Offerman G, Molzahn M. Reliability of drug history in analgesic users. Lancet 1984;2:1163-4.Google Scholar
- 16.Anonymous. Guidelines for ATC classification. Oslo: WHO Collaborating centre for drug statistics methodology-Nordic Council on medicines, 1990.Google Scholar
- 17.Herings RMC. PHARMO; a record linkage system for post-marketing surveillance of prescription drugs in the Netherlands. Utrecht: Utrecht University, 1993.Google Scholar
- 18.Leufkens. Pharmacy records in pharmacoepidemiology: studies on antiinflammatory and antirheumatic drugs. Utrecht: Utrecht University, 1990.Google Scholar
- 22.Cohen J. A coefficient of agreement for nominal scales. Educ Psychol Meas 1960;20:37-46.Google Scholar
- 23.Fleiss JL, Cohen J, Everitt BS. Large sample errors of kappa and weighted kappa. Psychol Bull 1969;72:323-7.Google Scholar