condition mean min max ZT0-3 303.187184 303.187184 303.187184 ZT4-7 640.2761175 640.2761175 640.2761175 ZT8-11 882.7531915 882.7531915 882.7531915 ZT12-15 642.324975 642.324975 642.324975 ZT16-19 696.4019805 696.4019805 696.4019805 ZT20-23 336.433181 336.433181 336.433181