condition mean min max ZT0-3 30.091627635 26.716516499999997 33.46673877 ZT4-7 15.2039549475 11.357627252 19.050282643 ZT8-11 12.944446228250001 8.1854389585 17.703453498000002 ZT12-15 14.0548928085 11.1033290995 17.0064565175 ZT16-19 9.02188231825 8.5168667125 9.526897924 ZT20-23 14.040765740000001 12.76817451 15.313356970000001