condition mean min max ZT0-3 31.700000000000003 31.700000000000003 31.700000000000003 ZT4-7 63.3 63.3 63.3 ZT8-11 55.949999999999996 55.949999999999996 55.949999999999996 ZT12-15 52.6 52.6 52.6 ZT16-19 43.1 43.1 43.1 ZT20-23 22.2 22.2 22.2