condition mean min max ZT0-3 0.7570612727499999 0.7127334879999999 0.8013890575 ZT4-7 0.29399711250000005 0.0 0.5879942250000001 ZT8-11 1.1065387105 0.4292972655 1.7837801555 ZT12-15 0.661907416 0.2051608275 1.1186540045 ZT16-19 2.69083582675 2.0490824885 3.332589165 ZT20-23 2.75255352325 2.7450991055 2.760007941