condition mean min max ZT0-3 8.56756 6.523820000000001 10.6113 ZT4-7 12.73542 12.73542 12.73542 ZT8-11 15.14865 15.14865 15.14865 ZT12-15 0 0 0 ZT16-19 7.536245 7.536245 7.536245 ZT20-23 16.2955 16.2955 16.2955