RESULTS	In multivariable models , young sex workers were at significantly higher STI risk compared with their older peers : The adjusted risk ratio ( aRR ) for GC comparing younger to older women was 1.50 ( 95 % confidence interval ( CI ) : 1.20 , 1.88 ) ; for CT , the aRR was 1.72 ( 95 % CI : 1.35 , 2.19 ) and for GC or CT combined , the aRR was 1.42 ( 95 % CI : 1.22 , 1.66 ) .\