condition mean min max ZT0-3 536.08391 536.08391 536.08391 ZT4-7 757.094467 757.094467 757.094467 ZT8-11 738.5287470000001 738.5287470000001 738.5287470000001 ZT12-15 498.070396 498.070396 498.070396 ZT16-19 341.88804300000004 341.88804300000004 341.88804300000004 ZT20-23 239.33378500000003 239.33378500000003 239.33378500000003