condition mean min max ZT0-3 7.357799999999999 7.357799999999999 7.357799999999999 ZT4-7 4.62039 4.62039 4.62039 ZT8-11 6.09025 6.09025 6.09025 ZT12-15 7.264085 7.264085 7.264085 ZT16-19 9.468275 9.468275 9.468275 ZT20-23 7.984579999999999 7.984579999999999 7.984579999999999