condition mean min max ZT0-3 89.399025 77.5715 101.22655 ZT4-7 51.07995 51.07995 51.07995 ZT8-11 25.53385 25.53385 25.53385 ZT12-15 0 0 0 ZT16-19 33.8998 33.8998 33.8998 ZT20-23 40.565799999999996 40.565799999999996 40.565799999999996