condition mean min max ZT0-3 1.6154853710000001 1.3523572220000002 1.87861352 ZT4-7 1.86596127825 0.8841704015 2.847752155 ZT8-11 6.34907402575 5.0047471705 7.6934008810000005 ZT12-15 8.343306269749998 8.261473093 8.4251394465 ZT16-19 3.7708699615 3.4876222489999997 4.054117674 ZT20-23 3.7992614247500005 3.3478072535 4.250715596000001