condition mean min max ZT0-3 19.0898 18.1614 20.0182 ZT4-7 33.613600000000005 33.613600000000005 33.613600000000005 ZT8-11 40.4495 40.4495 40.4495 ZT12-15 0 0 0 ZT16-19 40.155100000000004 40.155100000000004 40.155100000000004 ZT20-23 32.08055 32.08055 32.08055