condition mean min max ZT0-3 0.679501 0.0 1.4986575 ZT4-7 0.9054515000000001 0.9054515000000001 0.9054515000000001 ZT8-11 0.4698705 0.4698705 0.4698705 ZT12-15 0.5419475 0.0 1.083895 ZT16-19 0.868985 0.868985 0.868985 ZT20-23 0.687265 0.687265 0.687265