condition mean min max ZT0-3 22.434512 22.434512 22.434512 ZT4-7 26.6522765 26.6522765 26.6522765 ZT8-11 23.8214145 23.8214145 23.8214145 ZT12-15 21.6259595 21.6259595 21.6259595 ZT16-19 22.477998 22.477998 22.477998 ZT20-23 23.9259025 23.9259025 23.9259025