condition mean min max ZT0-3 490.419592 490.419592 490.419592 ZT4-7 375.5939875 375.5939875 375.5939875 ZT8-11 415.99412499999994 415.99412499999994 415.99412499999994 ZT12-15 451.5604015 451.5604015 451.5604015 ZT16-19 469.485876 469.485876 469.485876 ZT20-23 303.65513350000003 303.65513350000003 303.65513350000003