condition mean min max ZT0-3 14.46057 14.46057 14.46057 ZT4-7 11.305238 11.305238 11.305238 ZT8-11 9.8028815 9.8028815 9.8028815 ZT12-15 9.897774 9.897774 9.897774 ZT16-19 9.771602000000001 9.771602000000001 9.771602000000001 ZT20-23 10.4178735 10.4178735 10.4178735