condition mean min max ZT0-3 2.9900824999999998 2.739985 3.24018 ZT4-7 2.1347750000000003 2.1347750000000003 2.1347750000000003 ZT8-11 3.09962 3.09962 3.09962 ZT12-15 0 0 0 ZT16-19 3.009985 3.009985 3.009985 ZT20-23 3.247775 3.247775 3.247775