condition mean min max ZT0-3 3.820355 3.820355 3.820355 ZT4-7 11.934899999999999 11.934899999999999 11.934899999999999 ZT8-11 10.645495 10.645495 10.645495 ZT12-15 9.172665 9.172665 9.172665 ZT16-19 1.497145 1.497145 1.497145 ZT20-23 1.0759155 1.0759155 1.0759155