condition mean min max ZT0-3 0.059542573 0.0 0.119085146 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0123076215 0.0 0.024615243 ZT12-15 0.16956735525 0.034278742 0.3048559685 ZT16-19 0.35316212999999996 0.2992326815 0.4070915785 ZT20-23 0.142469428 0.0 0.284938856