condition mean min max ZT0-3 49.4 49.4 49.4 ZT4-7 67.3 67.3 67.3 ZT8-11 71.1 71.1 71.1 ZT12-15 54.2 54.2 54.2 ZT16-19 62.1 62.1 62.1 ZT20-23 36.9 36.9 36.9