SERPINE1 and metabolic syndrome: Generally, boys and girls with MetS had higher levels of PAI-1 (boys: 23.09 ± 19.86 ng/mL versus 15.50 ± 9.91 ng/mL; girls: 25.42 ± 12.65 ng/mL versus 16.70 ± 8.75 ng/mL).