condition mean min max ZT0-3 2.4294725 2.2668 2.592145 ZT4-7 2.9491300000000003 2.9491300000000003 2.9491300000000003 ZT8-11 1.826215 1.826215 1.826215 ZT12-15 0 0 0 ZT16-19 3.7072849999999997 3.7072849999999997 3.7072849999999997 ZT20-23 2.002355 2.002355 2.002355