condition mean min max ZT0-3 6.218093333333333 3.043075 9.72878 ZT4-7 11.096499999999999 11.096499999999999 11.096499999999999 ZT8-11 27.5379 27.5379 27.5379 ZT12-15 15.336807499999999 9.366264999999999 21.30735 ZT16-19 6.66933 6.66933 6.66933 ZT20-23 8.147255000000001 8.147255000000001 8.147255000000001