condition mean min max ZT0-3 16.35 16.35 16.35 ZT4-7 16.6 16.6 16.6 ZT8-11 18.0 18.0 18.0 ZT12-15 14.9 14.9 14.9 ZT16-19 8.65 8.65 8.65 ZT20-23 10.8 10.8 10.8