condition mean min max ZT0-3 23.8 23.8 23.8 ZT4-7 33.7 33.7 33.7 ZT8-11 47.2 47.2 47.2 ZT12-15 63.4 63.4 63.4 ZT16-19 46.25 46.25 46.25 ZT20-23 42.15 42.15 42.15