condition mean min max ZT0-3 28.622 25.65715 31.58685 ZT4-7 8.944445 8.944445 8.944445 ZT8-11 33.5546 33.5546 33.5546 ZT12-15 0 0 0 ZT16-19 33.057900000000004 33.057900000000004 33.057900000000004 ZT20-23 15.1827 15.1827 15.1827