condition mean min max ZT0-3 35.75 35.75 35.75 ZT4-7 8.8 8.8 8.8 ZT8-11 9.3 9.3 9.3 ZT12-15 5.1 5.1 5.1 ZT16-19 10.3 10.3 10.3 ZT20-23 7.9 7.9 7.9