condition mean min max ZT0-3 8.45 8.45 8.45 ZT4-7 10.0 10.0 10.0 ZT8-11 13.4 13.4 13.4 ZT12-15 11.1 11.1 11.1 ZT16-19 3.8 3.8 3.8 ZT20-23 28.7 28.7 28.7