condition mean min max ZT0-3 1.27498657425 0.876204471 1.6737686775 ZT4-7 1.3790495900000002 1.03968599 1.7184131900000001 ZT8-11 1.3674959652499998 0.801481345 1.9335105854999999 ZT12-15 3.34080906325 3.2380899625 3.443528164 ZT16-19 4.0419121845 3.901063723 4.182760646 ZT20-23 3.8215746665 3.7973062119999996 3.845843121