condition mean min max ZT0-3 1.52255905925 0.5751279285 2.46999019 ZT4-7 0.30780363175 0.157082733 0.45852453049999997 ZT8-11 0.6940640437500001 0.442933623 0.9451944645000001 ZT12-15 1.10688797825 1.006301154 1.2074748025 ZT16-19 3.07431149725 2.87931027 3.2693127244999998 ZT20-23 3.8617518045 3.331041534 4.392462075