condition mean min max ZT0-3 19.993850000000002 15.490649999999999 24.49705 ZT4-7 9.28727 9.28727 9.28727 ZT8-11 3.234075 3.234075 3.234075 ZT12-15 0 0 0 ZT16-19 8.92119 8.92119 8.92119 ZT20-23 11.018450000000001 11.018450000000001 11.018450000000001