condition mean min max ZT0-3 794.155134 794.155134 794.155134 ZT4-7 2003.9734600000002 2003.9734600000002 2003.9734600000002 ZT8-11 2222.9051335 2222.9051335 2222.9051335 ZT12-15 1979.6653455 1979.6653455 1979.6653455 ZT16-19 1054.27998 1054.27998 1054.27998 ZT20-23 861.4278515 861.4278515 861.4278515