condition mean min max ZT0-3 25.17268333333333 16.43505 31.12095 ZT4-7 16.74875 16.74875 16.74875 ZT8-11 16.53605 16.53605 16.53605 ZT12-15 18.166525 17.77535 18.5577 ZT16-19 26.164949999999997 26.164949999999997 26.164949999999997 ZT20-23 34.85365 34.85365 34.85365