condition mean min max ZT0-3 11.538625 11.538625 11.538625 ZT4-7 2.595325 2.595325 2.595325 ZT8-11 4.9189050000000005 4.9189050000000005 4.9189050000000005 ZT12-15 15.355550000000001 15.355550000000001 15.355550000000001 ZT16-19 4.48928 4.48928 4.48928 ZT20-23 14.563649999999999 14.563649999999999 14.563649999999999