condition mean min max ZT0-3 13.623201 13.623201 13.623201 ZT4-7 15.165211 15.165211 15.165211 ZT8-11 40.874022 40.874022 40.874022 ZT12-15 23.1688525 23.1688525 23.1688525 ZT16-19 235.854906 235.854906 235.854906 ZT20-23 188.118809 188.118809 188.118809