condition mean min max ZT0-3 35.20165 35.20165 35.20165 ZT4-7 27.4999 27.4999 27.4999 ZT8-11 17.0815 17.0815 17.0815 ZT12-15 15.19425 15.19425 15.19425 ZT16-19 23.0161 23.0161 23.0161 ZT20-23 22.87605 22.87605 22.87605