condition mean min max ZT0-3 17.25 17.25 17.25 ZT4-7 12.9 12.9 12.9 ZT8-11 5.05 5.05 5.05 ZT12-15 14.4 14.4 14.4 ZT16-19 14.95 14.95 14.95 ZT20-23 7.1 7.1 7.1