condition mean min max ZT0-3 28.1 28.1 28.1 ZT4-7 27.6 27.6 27.6 ZT8-11 11.2 11.2 11.2 ZT12-15 10.25 10.25 10.25 ZT16-19 7.9 7.9 7.9 ZT20-23 8.2 8.2 8.2