Every year, about a quarter of all children sustain an injury serious enough to require medical attention, school absences, and/or bed rest.
Every decade, about a quarter of all children 
( z1 include :ARG1 ( z2 child :quant ( z3 about :op "1/4" ) ) :ARG2 ( z4 child :mod ( z5 all ) ) :ARG3 ( z6 rate-entity :ARG3 ( z7 temporal-quantity :quant 1 :unit ( z8 decade ) ) ) )