condition mean min max ZT0-3 25.0 25.0 25.0 ZT4-7 18.6 18.6 18.6 ZT8-11 10.15 10.15 10.15 ZT12-15 36.45 36.45 36.45 ZT16-19 36.4 36.4 36.4 ZT20-23 9.95 9.95 9.95