However , no-OPV0 was associated with increased thymus/weight index after 2 weeks ( GMR : 1.22 ( 1.06-1 .40 ) ) , but the effect was not seen after 4 weeks ( GMR : 0.97 ( 0.92-1 .03 ) ) and 6 weeks ( GMR : 0.99 ( 0.82-1 .19 ) ) .