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Briefly, 40 drug words matched on length, frequency in the English language, and part of speech (noun, adjective, adverb, verb) with 40 household-related (neutral) items were used (Fig. 1); non-English words or slang words that may have not been recognized by the control subjects were not included.
In other metformin studies conducted by the authors, cases and controls were matched on length of time in the database (5).
In our studies we either matched on length of time in the database (2– 4), or we carefully assessed the comparability of exposure opportunity between cases and controls (5).
Two hundred eighty-two cases with a third-generation cephalosporin-resistant pathogen (203 with Enterobacter spp., 50 with Pseudomonas aeruginosa, and 29 with Klebsiella pneumoniae) were matched on length of stay to controls in a 1 2 ratio.
The stimuli in the two sets were matched on length of the property word, word frequency of the property and both concept words, and the Latent Semantic Analysis (LSA) cosine between the two concept words (Landauer & Dumais, 1997).
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We matched on enrollment length to control for differences in the number of medical claims due imbalances in enrollment length between the NF1 and non-NF1 groups.
Alcohol, goal-related, and neutral words were used that were matched on word length and frequency and semantic relatedness.
Trait-types were matched on word length and where possible frequency of occurrence although data on frequency were not available on some words, particularly those that were illness related.
In such studies, matching cases and controls on length of diabetes history invariably matches on duration of diabetes treatment, which will bias the observed measure of association toward no effect.
The children performed the task under three different conditions, matched for length of time on task.
Five controls were selected for each case matched on age, calendar year, and length of GHC membership, with the diagnosis date of the case assigned to each matched control as the reference date.
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CEO of Professional Science Editing for Scientists @ prosciediting.com