condition mean min max ZT0-3 16.10565 16.10565 16.10565 ZT4-7 12.8464 12.8464 12.8464 ZT8-11 9.135605 9.135605 9.135605 ZT12-15 12.308150000000001 12.308150000000001 12.308150000000001 ZT16-19 23.28855 23.28855 23.28855 ZT20-23 15.262799999999999 15.262799999999999 15.262799999999999