condition mean min max ZT0-3 9.25457274175 8.6631364795 9.846009003999999 ZT4-7 7.35710787125 6.666549528500001 8.047666214 ZT8-11 11.90998863925 8.9862913535 14.833685925000001 ZT12-15 11.1442126685 10.29744963 11.990975707 ZT16-19 9.814889806 8.402214242 11.22756537 ZT20-23 10.023067530750001 9.527259926500001 10.518875135