condition mean min max ZT0-3 12.739249999999998 12.739249999999998 12.739249999999998 ZT4-7 9.413945 9.413945 9.413945 ZT8-11 12.311 12.311 12.311 ZT12-15 11.96905 11.96905 11.96905 ZT16-19 16.587049999999998 16.587049999999998 16.587049999999998 ZT20-23 14.382 14.382 14.382