condition mean min max ZT0-3 9.15 9.15 9.15 ZT4-7 9.2 9.2 9.2 ZT8-11 14.2 14.2 14.2 ZT12-15 9.45 9.45 9.45 ZT16-19 11.65 11.65 11.65 ZT20-23 14.1 14.1 14.1