condition mean min max ZT0-3 11.50945 11.50945 11.50945 ZT4-7 6.619505 6.619505 6.619505 ZT8-11 6.570085000000001 6.570085000000001 6.570085000000001 ZT12-15 5.37078 5.37078 5.37078 ZT16-19 10.4666 10.4666 10.4666 ZT20-23 11.60515 11.60515 11.60515