condition mean min max ZT0-3 5.928002139 4.8409001190000005 7.015104159 ZT4-7 2.8765672782499996 2.6614374329999997 3.0916971235 ZT8-11 2.8787928532500002 2.841257445 2.9163282615 ZT12-15 4.92063378325 3.2263927420000003 6.614874824499999 ZT16-19 6.33097549475 5.2329101595 7.42904083 ZT20-23 12.80425196775 11.1300948655 14.47840907