condition mean min max ZT0-3 9.05 9.05 9.05 ZT4-7 11.9 11.9 11.9 ZT8-11 17.8 17.8 17.8 ZT12-15 8.95 8.95 8.95 ZT16-19 4.15 4.15 4.15 ZT20-23 9.55 9.55 9.55