condition mean min max ZT0-3 88.189481 88.189481 88.189481 ZT4-7 69.77378949999999 69.77378949999999 69.77378949999999 ZT8-11 75.5491735 75.5491735 75.5491735 ZT12-15 54.154223 54.154223 54.154223 ZT16-19 32.7812825 32.7812825 32.7812825 ZT20-23 16.6385595 16.6385595 16.6385595