condition mean min max ZT0-3 9.7 9.7 9.7 ZT4-7 13.1 13.1 13.1 ZT8-11 30.25 30.25 30.25 ZT12-15 6.15 6.15 6.15 ZT16-19 9.7 9.7 9.7 ZT20-23 12.7 12.7 12.7