condition mean min max ZT0-3 3.7850325000000002 3.51189 4.058175 ZT4-7 4.08837 4.08837 4.08837 ZT8-11 2.7223100000000002 2.7223100000000002 2.7223100000000002 ZT12-15 0 0 0 ZT16-19 2.8808949999999998 2.8808949999999998 2.8808949999999998 ZT20-23 4.8496950000000005 4.8496950000000005 4.8496950000000005