condition mean min max ZT0-3 4.5 4.5 4.5 ZT4-7 25.2 25.2 25.2 ZT8-11 40.95 40.95 40.95 ZT12-15 16.95 16.95 16.95 ZT16-19 21.8 21.8 21.8 ZT20-23 11.549999999999999 11.549999999999999 11.549999999999999