condition mean min max ZT0-3 12.086692 12.086692 12.086692 ZT4-7 11.742766499999998 11.742766499999998 11.742766499999998 ZT8-11 12.1944275 12.1944275 12.1944275 ZT12-15 10.1329615 10.1329615 10.1329615 ZT16-19 11.402614 11.402614 11.402614 ZT20-23 13.376504 13.376504 13.376504