condition mean min max ZT0-3 11.85 11.85 11.85 ZT4-7 16.6 16.6 16.6 ZT8-11 13.85 13.85 13.85 ZT12-15 7.75 7.75 7.75 ZT16-19 9.4 9.4 9.4 ZT20-23 16.45 16.45 16.45