condition mean min max ZT0-3 3.40555 3.40555 3.40555 ZT4-7 2.5698049999999997 2.5698049999999997 2.5698049999999997 ZT8-11 3.17753 3.17753 3.17753 ZT12-15 5.224895 5.224895 5.224895 ZT16-19 5.8009450000000005 5.8009450000000005 5.8009450000000005 ZT20-23 3.945195 3.945195 3.945195