condition mean min max ZT0-3 10.5 10.5 10.5 ZT4-7 5.1 5.1 5.1 ZT8-11 63.05 63.05 63.05 ZT12-15 13.05 13.05 13.05 ZT16-19 14.25 14.25 14.25 ZT20-23 9.7 9.7 9.7