condition mean min max ZT0-3 4.34446 4.264984999999999 4.423935 ZT4-7 5.1532350000000005 5.1532350000000005 5.1532350000000005 ZT8-11 5.23767 5.23767 5.23767 ZT12-15 0 0 0 ZT16-19 5.492465 5.492465 5.492465 ZT20-23 5.407575 5.407575 5.407575