condition mean min max ZT0-3 9.65 9.65 9.65 ZT4-7 11.4 11.4 11.4 ZT8-11 5.55 5.55 5.55 ZT12-15 19.45 19.45 19.45 ZT16-19 2.4 2.4 2.4 ZT20-23 13.25 13.25 13.25