condition mean min max ZT0-3 46.19551666666667 40.5757 51.418350000000004 ZT4-7 24.7115 24.7115 24.7115 ZT8-11 18.08265 18.08265 18.08265 ZT12-15 20.352075 20.3065 20.39765 ZT16-19 18.888399999999997 18.888399999999997 18.888399999999997 ZT20-23 31.57485 31.57485 31.57485