condition mean min max ZT0-3 10.95 10.95 10.95 ZT4-7 1.4 1.4 1.4 ZT8-11 24.55 24.55 24.55 ZT12-15 13.65 13.65 13.65 ZT16-19 5.05 5.05 5.05 ZT20-23 14.1 14.1 14.1