condition mean min max ZT0-3 33.12235 31.56805 34.676649999999995 ZT4-7 26.5934 26.5934 26.5934 ZT8-11 44.046350000000004 44.046350000000004 44.046350000000004 ZT12-15 0 0 0 ZT16-19 40.645 40.645 40.645 ZT20-23 37.19125 37.19125 37.19125