condition mean min max ZT0-3 52.3 52.3 52.3 ZT4-7 47.1 47.1 47.1 ZT8-11 62.3 62.3 62.3 ZT12-15 78.75 78.75 78.75 ZT16-19 80.1 80.1 80.1 ZT20-23 65.1 65.1 65.1