condition mean min max ZT0-3 13.050705 13.050705 13.050705 ZT4-7 12.980356 12.980356 12.980356 ZT8-11 13.2982875 13.2982875 13.2982875 ZT12-15 13.7173935 13.7173935 13.7173935 ZT16-19 13.016468 13.016468 13.016468 ZT20-23 13.5755275 13.5755275 13.5755275