condition mean min max ZT0-3 2.19317 1.47733 2.90901 ZT4-7 2.080815 2.080815 2.080815 ZT8-11 1.1849 1.1849 1.1849 ZT12-15 0 0 0 ZT16-19 3.341 3.341 3.341 ZT20-23 2.33896 2.33896 2.33896