condition mean min max ZT0-3 17.152324999999998 14.15445 20.150199999999998 ZT4-7 14.08005 14.08005 14.08005 ZT8-11 13.60935 13.60935 13.60935 ZT12-15 0 0 0 ZT16-19 19.06765 19.06765 19.06765 ZT20-23 21.46995 21.46995 21.46995