condition mean min max ZT0-3 12.95 12.95 12.95 ZT4-7 9.1 9.1 9.1 ZT8-11 31.1 31.1 31.1 ZT12-15 32.1 32.1 32.1 ZT16-19 26.2 26.2 26.2 ZT20-23 56.8 56.8 56.8