condition mean min max ZT0-3 35.834175 30.286900000000003 41.38145 ZT4-7 28.30325 28.30325 28.30325 ZT8-11 22.936799999999998 22.936799999999998 22.936799999999998 ZT12-15 0 0 0 ZT16-19 27.9058 27.9058 27.9058 ZT20-23 28.39725 28.39725 28.39725