condition mean min max ZT0-3 10.9 10.9 10.9 ZT4-7 2.9 2.9 2.9 ZT8-11 28.65 28.65 28.65 ZT12-15 32.6 32.6 32.6 ZT16-19 8.5 8.5 8.5 ZT20-23 39.2 39.2 39.2