condition mean min max ZT0-3 11.76366 9.584430000000001 13.3679 ZT4-7 10.019075 10.019075 10.019075 ZT8-11 6.855219999999999 6.855219999999999 6.855219999999999 ZT12-15 6.95298 6.70355 7.20241 ZT16-19 7.37089 7.37089 7.37089 ZT20-23 8.949345000000001 8.949345000000001 8.949345000000001