condition mean min max ZT0-3 522.970054 522.970054 522.970054 ZT4-7 584.0380895000001 584.0380895000001 584.0380895000001 ZT8-11 540.2759405 540.2759405 540.2759405 ZT12-15 574.9142815 574.9142815 574.9142815 ZT16-19 618.1890695 618.1890695 618.1890695 ZT20-23 435.55429849999996 435.55429849999996 435.55429849999996