condition mean min max ZT0-3 2.44225 1.607685 3.064355 ZT4-7 1.0617510000000001 1.0617510000000001 1.0617510000000001 ZT8-11 1.414605 1.414605 1.414605 ZT12-15 2.2026575 1.70963 2.695685 ZT16-19 2.663265 2.663265 2.663265 ZT20-23 3.517805 3.517805 3.517805