condition mean min max ZT0-3 10.45 10.45 10.45 ZT4-7 1.3 1.3 1.3 ZT8-11 10.15 10.15 10.15 ZT12-15 9.75 9.75 9.75 ZT16-19 11.5 11.5 11.5 ZT20-23 22.4 22.4 22.4