scholarly journals Feasibility of Including Cellular Telephone Numbers in Random Digit Dialing for Epidemiologic Case-Control Studies

2010 ◽  
Vol 173 (1) ◽  
pp. 118-126 ◽  
Author(s):  
L. F. Voigt ◽  
S. M. Schwartz ◽  
D. R. Doody ◽  
S. C. Lee ◽  
C. I. Li
Keyword(s):  
Case Control ◽  
Case Control Studies ◽  
Cellular Telephone ◽  
Random Digit Dialing ◽  
Random Digit

Evaluation of Random Digit Dialing as a Method of Control Selection in Case–Control Studies

1992 ◽  
Vol 135 (2) ◽  
pp. 210-222 ◽  
Author(s):  
Sara H. Olson ◽  
Jennifer L. Kelsey ◽  
Thomas A. Pearson ◽  
Bruce Levin
Keyword(s):  
Case Control ◽  
Case Control Studies ◽  
Random Digit Dialing ◽  
Random Digit ◽  
Control Selection

QUALITATIVE AND QUANTITATIVE ASSESSMENT OF GEOGRAPHIC CLUSTERING OF POPULATION SAMPLES SELECTED USING DIFFERENT METHODS OF RANDOM DIGIT DIALING

1990 ◽  
Vol 132 (supp1) ◽  
pp. 144-155 ◽  
Author(s):  
SCOTT DAVIS ◽  
ANDREW ROSS ◽  
LYNDA F. VOIGT ◽  
LINDA HEUSER
Keyword(s):  
Population Distribution ◽  
Geographic Area ◽  
Case Control Studies ◽  
Sex Structure ◽  
Population Sampling ◽  
Random Digit Dialing ◽  
Random Digit ◽  
Geographic Clustering ◽  
Two Measures ◽  
Set Of Points

Abstract Random digit dialing is a method commonly used to select random population samples in epidemiologic research. Although random digit dialing is generally presumed to provide representative samples, coverage and nonresponse errors may affect the degree to which the sample is representative. The present investigation was undertaken to determine whether the geographic distributions of samples selected using variations of the basic random digit dialing technique accurately reflect the underlying population distribution, and if not, whether such samples tend to be either more or less dispersed than the populations from which they were selected. Data regarding control groups from three case-control studies conducted from 1983–1986 were utilized. The residence addresses of 998 controls were located and assigned an X-Y coordinate and census tract designation within a three-county geographic area in northwest Washington State. Initially, the spatial distributions of controls were examined graphically in relation to the age-sex structure of the underlying population. No differences in geographic pattern were apparent A more formal statistical evaluation was conducted based on centrographic techniques utilizing two measures to describe the spatial distribution of a set of points. Results indicate that the samples chosen were neither more nor less dispersed than the underlying populations. However, the geographic centers of samples selected using primary numbers tended to be shifted from the centers of their respective populations. Several possible explanations for such shifts are considered, and extensions of the analytical approach are suggested in relation to the further evaluation of population sampling and the investigation of space-time aggregations of disease.

Case-Control Studies

2009 ◽  
Author(s):  
Ruth H. Keogh ◽  
D. R. Cox
Keyword(s):  
Case Control ◽  
Case Control Studies

Clinical Trials in Thrombosis: Secondary Prevention of Myocardial Infarction

1976 ◽  
Vol 35 (01) ◽  
pp. 049-056 ◽  
Author(s):  
Christian R Klimt ◽  
P. H Doub ◽  
Nancy H Doub
Keyword(s):  
Myocardial Infarction ◽  
Secondary Prevention ◽  
Case Control ◽  
Therapeutic Effects ◽  
Case Control Studies ◽  
Definitive Answer ◽  
Inhibition Of Platelet Aggregation ◽  
Prospective Trials

SummaryNumerous in vivo and in vitro experiments, investigating the inhibition of platelet aggregation and the prevention of experimentally-induced thrombosis, suggest that anti-platelet drugs, such as aspirin or the combination of aspirin and dipyridamole or sulfinpyrazone, may be effective anti-thrombotic agents in man. Since 1971, seven randomized prospective trials and two case-control studies have been referenced in the literature or are currently being conducted, which evaluate the effects of aspirin, sulfinpyrazone, or dipyridamole in combination with aspirin in the secondary prevention of myocardial infarction. A critical review of these trials indicates a range of evidence from no difference to a favorable trend that antiplatelet drugs may serve as anti-thrombotic agents in man. To date, a definitive answer concerning the therapeutic effects of these drugs in the secondary prevention of coronary heart disease is not available.

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