condition mean min max ZT0-3 52.45 52.45 52.45 ZT4-7 68.5 68.5 68.5 ZT8-11 56.1 56.1 56.1 ZT12-15 42.2 42.2 42.2 ZT16-19 58.75 58.75 58.75 ZT20-23 65.55 65.55 65.55