condition mean min max ZT0-3 10.010865 9.615675 10.272155000000001 ZT4-7 10.2914 10.2914 10.2914 ZT8-11 12.6039 12.6039 12.6039 ZT12-15 15.74365 13.70935 17.77795 ZT16-19 13.6613 13.6613 13.6613 ZT20-23 12.8233 12.8233 12.8233