condition mean min max ZT0-3 14.2436 14.2436 14.2436 ZT4-7 10.55902 10.55902 10.55902 ZT8-11 12.9304 12.9304 12.9304 ZT12-15 18.94735 18.94735 18.94735 ZT16-19 22.531100000000002 22.531100000000002 22.531100000000002 ZT20-23 18.861800000000002 18.861800000000002 18.861800000000002