condition mean min max ZT0-3 25.3 25.3 25.3 ZT4-7 17.8 17.8 17.8 ZT8-11 71.45 71.45 71.45 ZT12-15 7.949999999999999 7.949999999999999 7.949999999999999 ZT16-19 18.700000000000003 18.700000000000003 18.700000000000003 ZT20-23 17.6 17.6 17.6