condition mean min max ZT0-3 9.85 9.85 9.85 ZT4-7 8.0 8.0 8.0 ZT8-11 17.4 17.4 17.4 ZT12-15 26.35 26.35 26.35 ZT16-19 16.9 16.9 16.9 ZT20-23 11.95 11.95 11.95