condition mean min max ZT0-3 6.18631175325 4.290862185 8.0817613215 ZT4-7 5.80919991525 5.713271464 5.9051283665 ZT8-11 5.30507006325 4.481725334 6.1284147925 ZT12-15 8.26140774875 6.325494297500001 10.197321200000001 ZT16-19 7.38091830525 6.070625779 8.6912108315 ZT20-23 18.09591765 14.683144015 21.508691285