condition mean min max ZT0-3 4.6323550000000004 4.6323550000000004 4.6323550000000004 ZT4-7 2.2276949999999998 2.2276949999999998 2.2276949999999998 ZT8-11 5.649965 5.649965 5.649965 ZT12-15 11.04495 11.04495 11.04495 ZT16-19 10.486 10.486 10.486 ZT20-23 7.60208 7.60208 7.60208