condition mean min max ZT0-3 6.9113375 6.7347 7.087975 ZT4-7 4.89914 4.89914 4.89914 ZT8-11 3.4755599999999998 3.4755599999999998 3.4755599999999998 ZT12-15 0 0 0 ZT16-19 6.54894 6.54894 6.54894 ZT20-23 6.89732 6.89732 6.89732