condition mean min max ZT0-3 8.2 8.2 8.2 ZT4-7 26.3 26.3 26.3 ZT8-11 10.6 10.6 10.6 ZT12-15 8.25 8.25 8.25 ZT16-19 18.3 18.3 18.3 ZT20-23 10.25 10.25 10.25