condition mean min max ZT0-3 28.267088 28.267088 28.267088 ZT4-7 32.870131 32.870131 32.870131 ZT8-11 31.423574000000002 31.423574000000002 31.423574000000002 ZT12-15 30.6076505 30.6076505 30.6076505 ZT16-19 36.401751 36.401751 36.401751 ZT20-23 36.677749000000006 36.677749000000006 36.677749000000006