condition mean min max ZT0-3 3.65053 3.65053 3.65053 ZT4-7 30.478125 30.478125 30.478125 ZT8-11 6.00826 6.00826 6.00826 ZT12-15 5.67505 5.67505 5.67505 ZT16-19 1.40801 1.40801 1.40801 ZT20-23 3.50964 3.50964 3.50964