condition mean min max ZT0-3 901.462826 901.462826 901.462826 ZT4-7 701.1818095 701.1818095 701.1818095 ZT8-11 766.9179905 766.9179905 766.9179905 ZT12-15 884.5669995000001 884.5669995000001 884.5669995000001 ZT16-19 869.585417 869.585417 869.585417 ZT20-23 993.5162270000001 993.5162270000001 993.5162270000001