condition mean min max ZT0-3 29.54095 27.457549999999998 31.62435 ZT4-7 23.59245 23.59245 23.59245 ZT8-11 29.93805 29.93805 29.93805 ZT12-15 0 0 0 ZT16-19 35.6572 35.6572 35.6572 ZT20-23 28.60405 28.60405 28.60405