condition mean min max ZT0-3 12.872454 12.872454 12.872454 ZT4-7 15.872697500000001 15.872697500000001 15.872697500000001 ZT8-11 13.630348000000001 13.630348000000001 13.630348000000001 ZT12-15 11.5986005 11.5986005 11.5986005 ZT16-19 9.485065500000001 9.485065500000001 9.485065500000001 ZT20-23 9.498255499999999 9.498255499999999 9.498255499999999