condition mean min max ZT0-3 14.304368 14.304368 14.304368 ZT4-7 44.6417345 44.6417345 44.6417345 ZT8-11 62.718603 62.718603 62.718603 ZT12-15 41.506125 41.506125 41.506125 ZT16-19 35.466331499999995 35.466331499999995 35.466331499999995 ZT20-23 23.787027000000002 23.787027000000002 23.787027000000002