condition mean min max ZT0-3 3.5120366666666665 2.55694 4.498425 ZT4-7 2.6538899999999996 2.6538899999999996 2.6538899999999996 ZT8-11 2.01669 2.01669 2.01669 ZT12-15 3.923395 3.2142999999999997 4.632490000000001 ZT16-19 2.08019 2.08019 2.08019 ZT20-23 2.52428 2.52428 2.52428