condition mean min max ZT0-3 2.69045947675 2.1891921274999997 3.191726826 ZT4-7 1.43681600725 1.410247208 1.4633848065000001 ZT8-11 1.8500080195 1.486287866 2.213728173 ZT12-15 2.7672718429999996 2.2655054855 3.2690382005 ZT16-19 4.7751583879999995 4.5310233545 5.0192934215 ZT20-23 4.5151038337500005 4.102127201 4.9280804665