condition mean min max ZT0-3 21.244943 21.244943 21.244943 ZT4-7 20.467412500000002 20.467412500000002 20.467412500000002 ZT8-11 17.7224475 17.7224475 17.7224475 ZT12-15 70.3350045 70.3350045 70.3350045 ZT16-19 27.409707499999996 27.409707499999996 27.409707499999996 ZT20-23 180.74841550000002 180.74841550000002 180.74841550000002