PLOD1 and polycystic ovary syndrome: In the total group of PCOS, salivary cortisol levels showed positive and significant correlation with LH levels (r = 0.40; P = 0.016) (Figure 1) and negative correlation with HOMA-IR (r = −0.48; P = 0.003), fasting insulin levels (r = −0.47; P = 0.003), and BMI (r = −0.52; P = 0.001) (Figure 2).