condition mean min max ZT0-3 13.404024999999999 11.66255 15.145499999999998 ZT4-7 4.821809999999999 4.821809999999999 4.821809999999999 ZT8-11 8.884415 8.884415 8.884415 ZT12-15 0 0 0 ZT16-19 12.2832 12.2832 12.2832 ZT20-23 13.90205 13.90205 13.90205