condition mean min max ZT0-3 6.263625 5.13841 7.38884 ZT4-7 3.7211600000000002 3.7211600000000002 3.7211600000000002 ZT8-11 4.345085 4.345085 4.345085 ZT12-15 0 0 0 ZT16-19 6.55813 6.55813 6.55813 ZT20-23 5.50666 5.50666 5.50666