condition mean min max ZT0-3 10.45 10.45 10.45 ZT4-7 10.2 10.2 10.2 ZT8-11 4.6 4.6 4.6 ZT12-15 6.7 6.7 6.7 ZT16-19 7.0 7.0 7.0 ZT20-23 5.85 5.85 5.85