condition mean min max ZT0-3 1.371955 1.371955 1.371955 ZT4-7 0.828829 0.828829 0.828829 ZT8-11 1.52419 1.52419 1.52419 ZT12-15 1.89815 1.89815 1.89815 ZT16-19 1.926645 1.926645 1.926645 ZT20-23 2.3104899999999997 2.3104899999999997 2.3104899999999997