condition mean min max ZT0-3 23.700000000000003 23.700000000000003 23.700000000000003 ZT4-7 22.6 22.6 22.6 ZT8-11 13.1 13.1 13.1 ZT12-15 3.8000000000000003 3.8000000000000003 3.8000000000000003 ZT16-19 19.6 19.6 19.6 ZT20-23 14.25 14.25 14.25