condition mean min max ZT0-3 682.162508 682.162508 682.162508 ZT4-7 728.271123 728.271123 728.271123 ZT8-11 620.013293 620.013293 620.013293 ZT12-15 680.761887 680.761887 680.761887 ZT16-19 796.177164 796.177164 796.177164 ZT20-23 882.1030925 882.1030925 882.1030925