condition mean min max ZT0-3 6.55757 6.121779999999999 6.993360000000001 ZT4-7 2.118575 2.118575 2.118575 ZT8-11 0.66393 0.66393 0.66393 ZT12-15 0 0 0 ZT16-19 1.633272 1.633272 1.633272 ZT20-23 3.968585 3.968585 3.968585