condition mean min max ZT0-3 39.18705 39.18705 39.18705 ZT4-7 25.7074 25.7074 25.7074 ZT8-11 21.27795 21.27795 21.27795 ZT12-15 16.91145 16.91145 16.91145 ZT16-19 28.567700000000002 28.567700000000002 28.567700000000002 ZT20-23 36.945350000000005 36.945350000000005 36.945350000000005