condition mean min max ZT0-3 10.67987 10.42436 10.9795 ZT4-7 9.835655 9.835655 9.835655 ZT8-11 9.221689999999999 9.221689999999999 9.221689999999999 ZT12-15 12.178225000000001 11.05615 13.3003 ZT16-19 10.620805 10.620805 10.620805 ZT20-23 12.423 12.423 12.423