condition mean min max ZT0-3 0.35608762925000004 0.110030285 0.6021449735000001 ZT4-7 2.7516376187500002 1.7923582639999998 3.7109169735000003 ZT8-11 11.306883272 8.538080996 14.075685548 ZT12-15 28.500009732499997 25.429552335 31.570467129999997 ZT16-19 23.22155826 22.160105899999998 24.28301062 ZT20-23 15.6021264675 14.603095515 16.60115742