condition mean min max ZT0-3 34.9 34.9 34.9 ZT4-7 37.6 37.6 37.6 ZT8-11 58.45 58.45 58.45 ZT12-15 63.55 63.55 63.55 ZT16-19 50.55 50.55 50.55 ZT20-23 50.0 50.0 50.0