condition mean min max ZT0-3 22.043925 21.69695 22.390900000000002 ZT4-7 36.302400000000006 36.302400000000006 36.302400000000006 ZT8-11 46.31955 46.31955 46.31955 ZT12-15 0 0 0 ZT16-19 42.3368 42.3368 42.3368 ZT20-23 39.64985 39.64985 39.64985