condition mean min max ZT0-3 22.95 22.95 22.95 ZT4-7 2.7 2.7 2.7 ZT8-11 17.0 17.0 17.0 ZT12-15 7.05 7.05 7.05 ZT16-19 14.95 14.95 14.95 ZT20-23 2.4 2.4 2.4