condition mean min max ZT0-3 73.92525 73.92525 73.92525 ZT4-7 78.72995 78.72995 78.72995 ZT8-11 47.3373 47.3373 47.3373 ZT12-15 46.3909 46.3909 46.3909 ZT16-19 51.2581 51.2581 51.2581 ZT20-23 56.05265 56.05265 56.05265