condition mean min max ZT0-3 21.59835 21.59835 21.59835 ZT4-7 5.925865 5.925865 5.925865 ZT8-11 8.371645000000001 8.371645000000001 8.371645000000001 ZT12-15 9.937785 9.937785 9.937785 ZT16-19 16.13545 16.13545 16.13545 ZT20-23 36.106300000000005 36.106300000000005 36.106300000000005