condition mean min max ZT0-3 16.223857073250002 8.2200162565 24.22769789 ZT4-7 8.0537642655 4.087937341 12.01959119 ZT8-11 12.32653389 11.161461845 13.491605934999999 ZT12-15 9.051216934500001 8.476903996 9.625529873 ZT16-19 11.66811120775 10.3097021685 13.026520247 ZT20-23 11.600117085 11.51954707 11.6806871