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(a) Difference in peak-to-peak amplitude between P200 and N550 components of K-complex by exposure group, adjusted for postmenstrual age at electroencephalogram (EEG). CTL = 17 drug-free infants, PNE = 16 with prenatal nicotine exposure. F = 3.74, p = .036. (b) Delta power of K-complex measured at the Cz electrode, adjusted for postmenstrual age at EEG, by group; F = 3.76, p = .035.
