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Fig. 3 | Environmental Health

Fig. 3

From: Wrangling environmental exposure data: guidance for getting the best information from your laboratory measurements

Fig. 3

In this example from our data, recoveries of surrogate d4-di-n-butyl-phthalate from air samples showed notable upward and downward trends over time, despite largely staying within the 50–150% acceptable bounds. Here we were examining surrogate recoveries in batches of samples from different studies analyzed at the same laboratory. The last two batches (Sept 2014 and May 2015) were from the same study but collected approximately a year apart per the study design

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