( Gonorrhea ( ( is ( ( ( ( associated ( with ( ( a ( three-fold increase ) ) ( in ( the ( preterm ( birth rate ) ) ) ) ) ) ) , ) and ) ( ( syphilis ( , ( chlamydia ( , ( and ( bacterial ( vaginosis infections ) ) ) ) ) ) ) ( with ( ( a ( two-fold increase ) ) ( in ( preterm births ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Gonorrhea)) (VP (VBZ is) (VP (VP (VBN associated) (PP (IN with) (NP (NP (DT a) (JJ three-fold) (NN increase)) (PP (IN in) (NP (DT the) (NN preterm) (NN birth) (NN rate)))))) (, ,) (CC and) (VP (NP (NNS syphilis) (, ,) (NNS chlamydia) (, ,) (CC and) (JJ bacterial) (NN vaginosis) (NNS infections)) (PP (IN with) (NP (NP (DT a) (JJ two-fold) (NN increase)) (PP (IN in) (NP (NN preterm) (NNS births)))))))) (. .)))
Gonorrhea is associated with a three-fold increase in the preterm birth rate, and syphilis, chlamydia, and bacterial vaginosis infections with a two-fold increase in preterm births.
(ROOT (S (NP (NNP Chlamydia) (, ,) (NNP gonorrhea) (, ,) (CC and) (NNP syphilis)) (VP (VBP are) (NP (NP (NNS examples)) (PP (IN of) (NP (JJ bacterial) (NNS stis))))) (. .)))