condition mean min max ZT0-3 42.55 42.55 42.55 ZT4-7 56.4 56.4 56.4 ZT8-11 73.35 73.35 73.35 ZT12-15 11.1 11.1 11.1 ZT16-19 29.2 29.2 29.2 ZT20-23 62.9 62.9 62.9