Mean (± SD) waking and evening salivary free testosterone in non-mothers, mothers whose youngest offspring is less than 2 years of age, and mothers of older children (2+ years of age). Sample sizes in parentheses. Adjusted for time of saliva measurement, usual wake time, wake time that day, oral contraceptive use and being in the late follicular stage of the menstrual cycle. Significant differences: Waking T, mothers of young offspring vs. older offspring p<0.051, mothers of young offspring vs. non-mothers p<0.002; Evening T, mothers of older offspring vs. non-mothers (p<0.044) and mothers of young offspring (p<0.004).