condition mean min max ZT0-3 1.8141129475 1.467289868 2.160936027 ZT4-7 2.26213646 1.982739414 2.541533506 ZT8-11 2.40165632225 2.3180657655 2.485246879 ZT12-15 3.021484997 2.086319443 3.956650551 ZT16-19 3.41975335825 3.026500747 3.8130059695 ZT20-23 4.931261902999999 4.899201378 4.963322428