condition mean min max ZT0-3 1.0665008333333335 0.566947 1.906565 ZT4-7 0.2944075 0.2944075 0.2944075 ZT8-11 1.1585 1.1585 1.1585 ZT12-15 0.6474705 0.48571549999999997 0.8092254999999999 ZT16-19 1.679745 1.679745 1.679745 ZT20-23 1.245215 1.245215 1.245215