condition mean min max ZT0-3 11.2 11.2 11.2 ZT4-7 4.4 4.4 4.4 ZT8-11 17.45 17.45 17.45 ZT12-15 23.65 23.65 23.65 ZT16-19 5.65 5.65 5.65 ZT20-23 8.45 8.45 8.45