condition mean min max ZT0-3 1.1539883333333334 0.0 1.79324 ZT4-7 1.632835 1.632835 1.632835 ZT8-11 3.42753 3.42753 3.42753 ZT12-15 1.787235 0.0 3.57447 ZT16-19 1.601015 1.601015 1.601015 ZT20-23 0.0 0.0 0.0