condition mean min max ZT0-3 1.223665 0.0 2.44733 ZT4-7 0.482071 0.482071 0.482071 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.4802045 0.4802045 0.4802045 ZT20-23 1.9302515 1.9302515 1.9302515