condition mean min max ZT0-3 830.723079 830.723079 830.723079 ZT4-7 562.4094895000001 562.4094895000001 562.4094895000001 ZT8-11 1130.5260095 1130.5260095 1130.5260095 ZT12-15 980.103049 980.103049 980.103049 ZT16-19 842.5878435 842.5878435 842.5878435 ZT20-23 906.9181195 906.9181195 906.9181195