condition mean min max ZT0-3 9.95 9.95 9.95 ZT4-7 19.1 19.1 19.1 ZT8-11 9.8 9.8 9.8 ZT12-15 11.5 11.5 11.5 ZT16-19 36.6 36.6 36.6 ZT20-23 40.0 40.0 40.0