condition mean min max ZT0-3 1.9030575 1.5870700000000002 2.219045 ZT4-7 2.2341300000000004 2.2341300000000004 2.2341300000000004 ZT8-11 3.349195 3.349195 3.349195 ZT12-15 0 0 0 ZT16-19 4.702215000000001 4.702215000000001 4.702215000000001 ZT20-23 2.13567 2.13567 2.13567