condition mean min max ZT0-3 14.549999999999999 14.549999999999999 14.549999999999999 ZT4-7 4.4 4.4 4.4 ZT8-11 5.199999999999999 5.199999999999999 5.199999999999999 ZT12-15 31.150000000000002 31.150000000000002 31.150000000000002 ZT16-19 12.75 12.75 12.75 ZT20-23 5.3 5.3 5.3