condition mean min max ZT0-3 1.4128779999999999 0.9559185 1.8698374999999998 ZT4-7 5.664925 5.664925 5.664925 ZT8-11 3.4228449999999997 3.4228449999999997 3.4228449999999997 ZT12-15 0 0 0 ZT16-19 3.85066 3.85066 3.85066 ZT20-23 2.73841 2.73841 2.73841