condition mean min max ZT0-3 0.58274585375 0.31677043899999996 0.8487212685000001 ZT4-7 0.9159728795 0.9025994235 0.9293463355 ZT8-11 0.7723922892499999 0.7701284445 0.774656134 ZT12-15 0.7119717022500001 0.63197842 0.7919649845000001 ZT16-19 1.2306761397500001 0.923391676 1.5379606035000002 ZT20-23 2.03176514875 1.8203561230000003 2.2431741745