condition mean min max ZT0-3 638.1126666666667 478.573 721.3785 ZT4-7 434.23400000000004 434.23400000000004 434.23400000000004 ZT8-11 427.354 427.354 427.354 ZT12-15 542.79475 506.759 578.8305 ZT16-19 606.6945 606.6945 606.6945 ZT20-23 902.634 902.634 902.634