condition mean min max ZT0-3 0.14742075 0.1415305 0.153311 ZT4-7 0.1959804 0.1959804 0.1959804 ZT8-11 0.3412655 0.3412655 0.3412655 ZT12-15 0 0 0 ZT16-19 0.22268300000000002 0.22268300000000002 0.22268300000000002 ZT20-23 0.11211445 0.11211445 0.11211445