condition mean min max ZT0-3 0.6550655224999999 0.099278885 1.21085216 ZT4-7 1.22659345075 0.7721490740000001 1.6810378275 ZT8-11 5.607411814999999 3.1300575124999996 8.0847661175 ZT12-15 16.942032980500002 13.113241916 20.770824045 ZT16-19 18.463631925 18.39066684 18.53659701 ZT20-23 19.165033237499998 18.53992783 19.790138645