condition mean min max ZT0-3 44.650052 44.650052 44.650052 ZT4-7 35.6128935 35.6128935 35.6128935 ZT8-11 29.042531500000003 29.042531500000003 29.042531500000003 ZT12-15 33.5340695 33.5340695 33.5340695 ZT16-19 30.3396265 30.3396265 30.3396265 ZT20-23 28.7491085 28.7491085 28.7491085