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Exact(8)
The adjusted values were then compared between exposed and reference groups.
Using random-effects models, we estimated the standardized mean difference between exposed and reference groups across all studies.
The average time for neurocognitive testing was 72.9 ± 22.1 min; this was similar between exposed and reference groups.
Results: The standardized weighted mean difference in IQ score between exposed and reference populations was –0.45 (95% confidence interval: –0.56, –0.35) using a random-effects model.
We used the Student's t-test and chi-square test to determine differences in the demographics between exposed and reference groups.
Height, body weight, body mass index (BMI), and self-reported smoking and alcohol use were not statistically different between exposed and reference groups (Table 2).
Similar(52)
None of the studies had data on exposure level, and the RRs were compared between exposed workers and reference populations, either a group of unexposed workers or the general population.
"The challenge was the push and pull between exposed and not exposed," Cotton says.
Table 2 compares the exposed and reference groups.
The exposed and reference populations both lived in a fairly homogeneous area and shared environmental, occupational, social, and cultural features.
Cut-offs to differentiate between exposed and non-exposed individuals were determined using finite mixed modeling (FMM).
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