condition mean min max ZT0-3 11.020735 9.462855000000001 12.16255 ZT4-7 12.515699999999999 12.515699999999999 12.515699999999999 ZT8-11 12.2904 12.2904 12.2904 ZT12-15 12.1387125 10.729475 13.54795 ZT16-19 11.4481 11.4481 11.4481 ZT20-23 11.475200000000001 11.475200000000001 11.475200000000001