condition mean min max ZT0-3 1.51308275 0.9879655 2.0382 ZT4-7 1.5813495 1.5813495 1.5813495 ZT8-11 1.95065 1.95065 1.95065 ZT12-15 0 0 0 ZT16-19 1.67835 1.67835 1.67835 ZT20-23 1.3607735 1.3607735 1.3607735