condition mean min max ZT0-3 4.6494525 3.863255 5.43565 ZT4-7 5.139935 5.139935 5.139935 ZT8-11 6.27345 6.27345 6.27345 ZT12-15 0 0 0 ZT16-19 5.750425 5.750425 5.750425 ZT20-23 5.780775 5.780775 5.780775