condition mean min max ZT0-3 14.7 14.7 14.7 ZT4-7 26.2 26.2 26.2 ZT8-11 31.5 31.5 31.5 ZT12-15 5.85 5.85 5.85 ZT16-19 8.4 8.4 8.4 ZT20-23 4.6 4.6 4.6