condition mean min max ZT0-3 8.4 8.4 8.4 ZT4-7 36.5 36.5 36.5 ZT8-11 45.75 45.75 45.75 ZT12-15 5.4 5.4 5.4 ZT16-19 17.55 17.55 17.55 ZT20-23 7.95 7.95 7.95