Figure 1

Mean salivary steroid concentrations as a function of the number of days prior to parturition. The women (n = 28) were tested between 32 and 38 weeks of gestation. Means are shown according to the number of days prior to delivery (< 14 days, 14–21 days, 22–28 days, 29+ days, n=7/group). Error bars represent the standard error of the mean.