condition mean min max ZT0-3 5.15 5.15 5.15 ZT4-7 16.2 16.2 16.2 ZT8-11 13.4 13.4 13.4 ZT12-15 5.2 5.2 5.2 ZT16-19 13.5 13.5 13.5 ZT20-23 26.85 26.85 26.85