condition mean min max ZT0-3 39.599025 38.27915 40.9189 ZT4-7 46.998599999999996 46.998599999999996 46.998599999999996 ZT8-11 51.36725 51.36725 51.36725 ZT12-15 0 0 0 ZT16-19 61.66185 61.66185 61.66185 ZT20-23 50.9294 50.9294 50.9294