condition mean min max ZT0-3 5.2 5.2 5.2 ZT4-7 5.2 5.2 5.2 ZT8-11 31.6 31.6 31.6 ZT12-15 5.65 5.65 5.65 ZT16-19 14.65 14.65 14.65 ZT20-23 16.85 16.85 16.85