condition mean min max ZT0-3 18.2358474275 15.18163527 21.290059585 ZT4-7 17.6080133 15.357873519999998 19.85815308 ZT8-11 12.06713237525 9.7162847255 14.417980025 ZT12-15 13.56772252475 8.256817656499999 18.878627393000002 ZT16-19 60.435952209999996 46.76075753 74.11114689 ZT20-23 84.7738993375 73.888699715 95.65909896