condition mean min max ZT0-3 5.724255 5.724255 5.724255 ZT4-7 4.38066 4.38066 4.38066 ZT8-11 4.096865 4.096865 4.096865 ZT12-15 4.7277450000000005 4.7277450000000005 4.7277450000000005 ZT16-19 5.760445 5.760445 5.760445 ZT20-23 5.440110000000001 5.440110000000001 5.440110000000001