condition mean min max ZT0-3 0.64983874375 0.585928143 0.7137493445 ZT4-7 1.2471999357499999 0.908607672 1.5857921995 ZT8-11 1.7778080555 1.7513855165 1.8042305945000001 ZT12-15 1.8013562750000003 1.6530592410000002 1.9496533090000001 ZT16-19 2.56631000825 1.9366144985 3.1960055179999998 ZT20-23 4.402232671749999 3.6215380105 5.182927332999999