RESULTS	( 2 ) The prolactin levels of labor analgesia group [ ( 19.5 + / - 8.4 ) nmol/L and ( 14.5 + / - 5.6 ) nmol/L ] were lower than those of control group [ ( 22.6 + / - 7.2 ) nmol/L and ( 16.9 + / - 5.7 ) nmol/L ] 2 and 24 hours after delivery ( P < 0.05 ) .\