condition mean min max ZT0-3 447.066891 447.066891 447.066891 ZT4-7 755.0465755 755.0465755 755.0465755 ZT8-11 466.425556 466.425556 466.425556 ZT12-15 599.4696309999999 599.4696309999999 599.4696309999999 ZT16-19 848.970994 848.970994 848.970994 ZT20-23 2126.26835 2126.26835 2126.26835