condition mean min max ZT0-3 1.713749 1.0806645000000001 2.31561 ZT4-7 0.360477 0.360477 0.360477 ZT8-11 0.517401 0.517401 0.517401 ZT12-15 1.3039300000000003 0.47909 2.1287700000000003 ZT16-19 2.23725 2.23725 2.23725 ZT20-23 1.7080585000000001 1.7080585000000001 1.7080585000000001