condition mean min max ZT0-3 6.50288 6.370105000000001 6.635655 ZT4-7 5.182285 5.182285 5.182285 ZT8-11 22.37585 22.37585 22.37585 ZT12-15 0 0 0 ZT16-19 22.120649999999998 22.120649999999998 22.120649999999998 ZT20-23 12.78915 12.78915 12.78915