condition mean min max ZT0-3 12.15 12.15 12.15 ZT4-7 7.4 7.4 7.4 ZT8-11 46.65 46.65 46.65 ZT12-15 11.5 11.5 11.5 ZT16-19 15.1 15.1 15.1 ZT20-23 24.5 24.5 24.5