condition mean min max ZT0-3 15.178550000000001 15.178550000000001 15.178550000000001 ZT4-7 14.3601 14.3601 14.3601 ZT8-11 13.90355 13.90355 13.90355 ZT12-15 18.50425 18.50425 18.50425 ZT16-19 20.845149999999997 20.845149999999997 20.845149999999997 ZT20-23 21.2392 21.2392 21.2392