condition mean min max ZT0-3 1.07998075 1.005654 1.1543075 ZT4-7 1.1925255 1.1925255 1.1925255 ZT8-11 1.2814135 1.2814135 1.2814135 ZT12-15 0 0 0 ZT16-19 3.7609250000000003 3.7609250000000003 3.7609250000000003 ZT20-23 1.9309599999999998 1.9309599999999998 1.9309599999999998