condition mean min max ZT0-3 2.73985 2.202075 3.3573950000000004 ZT4-7 2.73279 2.73279 2.73279 ZT8-11 1.69434 1.69434 1.69434 ZT12-15 2.9602975 2.5248049999999997 3.39579 ZT16-19 4.11448 4.11448 4.11448 ZT20-23 5.044605000000001 5.044605000000001 5.044605000000001