condition mean min max ZT0-3 0.663531654 0.532511383 0.794551925 ZT4-7 1.581337987 1.0669813119999998 2.095694662 ZT8-11 1.2699205275 1.033956137 1.505884918 ZT12-15 0.8901107856666667 0.5606239653333334 1.219597606 ZT16-19 0.7431811078333334 0.527173862 0.9591883536666667 ZT20-23 0.5448210115000001 0.448766605 0.640875418