condition mean min max ZT0-3 25.749875 25.40235 26.0974 ZT4-7 23.3345 23.3345 23.3345 ZT8-11 27.83945 27.83945 27.83945 ZT12-15 0 0 0 ZT16-19 32.03115 32.03115 32.03115 ZT20-23 31.155099999999997 31.155099999999997 31.155099999999997