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The primary efficacy variable was therefore defined as the proportion of urine samples negative for drugs of abuse.
The rate of positive urine tests is defined as the proportion of urine samples tested positive for opioids among the total urine samples submitted.
Nevertheless a sizeable proportion of urine solids are produced by humans (59 g/cap/day) and the calorific value of urine (1701 kcal/kg) could contribute to energy production if efficient dewatering technologies were available.
Most clinical specimens were isolated from urine samples, and a greater proportion of urine isolates were detected in specimens from control-residents as compared to case-residents (p = 0.05) (Table 2).
Methyl paraben (MP), ethyl paraben (EP), propyl paraben (PP), and butyl paraben (BP) have recently been detected in a high proportion of urine samples collected as part of a national U.S. survey of exposure to environmental chemicals (Calafat et al. 2010).
In our article (Coronado et al. 2004), we reported a higher proportion of urine samples containing detectable levels of the organophosphate (OP) pesticide urinary metabolite dimethylthiophosphate (DMTP) from children of farmworkers who reported having thinned plants, compared with urine samples from children of non-thinners.
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These estimated increases appeared sensitive to the large proportion of urine-based data in earlier years that were collected in Intersalt (1985 1987).
We found differences across subjects in the average proportion of urines correctly identified (Experiment 1: F(17,255) = 4.02, P < 0.001, Experiment 2: F(18,252) = 4.92, P < 0.001).
In addition, the proportions of urine samples that were positive for cannabis, cocaine or benzodiazepines were not significantly different between treatments.
Previously, we reported higher proportions of urine samples with detectable levels of the OP pesticide urinary metabolite DMTP from children of farmworkers who reported thinning, compared with urine samples from children of nonthinners.
The proportion of positive urine cultures was 32% (207/651) in voided urine specimens in 2003, 35% (147/421) in 2012, and 46% (27/59) in urine samples from catheters in 2012.
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