Coefficient of variation for mixed-function oxidase (MFO), glutathione <i>S</i>-transferase (GST), alpha-carboxylesterase (α-CarE), and beta-carboxylesterase (β-CarE) specific activities in female <i>Culex pipiens</i> complex from four different trapping locations in some Northwest suburbs of Chicago, Illinois, USA.

Larger numbers indicate greater variability relative to their mean.