condition mean min max ZT0-3 21.15 21.15 21.15 ZT4-7 12.2 12.2 12.2 ZT8-11 18.15 18.15 18.15 ZT12-15 7.65 7.65 7.65 ZT16-19 19.7 19.7 19.7 ZT20-23 15.45 15.45 15.45