Figure 7: Box plot representations of salivary opiorphin levels in healthy young men, women and pregnant women under basal (B) and stimulated (S) salivary secretion conditions. Single individual values below the 10th or above the 90th percentile are represented as open circles. The box intersecting line represents the median and the box upper and lower limits represent the 75% and 25% percentile, respectively. **P<0.01; ***P<0.001 by MWT; (n) number of subjects, B basal conditions, S stimulated conditions.