condition mean min max ZT0-3 11.0085875 10.417125 11.60005 ZT4-7 10.1791 10.1791 10.1791 ZT8-11 21.51475 21.51475 21.51475 ZT12-15 0 0 0 ZT16-19 19.85605 19.85605 19.85605 ZT20-23 16.964399999999998 16.964399999999998 16.964399999999998