condition mean min max ZT0-3 10.2 10.2 10.2 ZT4-7 2.7 2.7 2.7 ZT8-11 11.65 11.65 11.65 ZT12-15 2.7 2.7 2.7 ZT16-19 5.2 5.2 5.2 ZT20-23 14.5 14.5 14.5