condition mean min max ZT0-3 2.8065825 2.733615 2.87955 ZT4-7 3.77476 3.77476 3.77476 ZT8-11 3.001915 3.001915 3.001915 ZT12-15 0 0 0 ZT16-19 4.720485 4.720485 4.720485 ZT20-23 4.30537 4.30537 4.30537