condition mean min max ZT0-3 9.950791 9.950791 9.950791 ZT4-7 9.603743999999999 9.603743999999999 9.603743999999999 ZT8-11 9.208722999999999 9.208722999999999 9.208722999999999 ZT12-15 11.211518 11.211518 11.211518 ZT16-19 8.741452 8.741452 8.741452 ZT20-23 7.7219815 7.7219815 7.7219815