condition mean min max ZT0-3 1.2894832487499999 1.279289312 1.2996771855 ZT4-7 0.99257391725 0.6878859465 1.297261888 ZT8-11 4.16218319275 3.1472079875000003 5.1771583979999996 ZT12-15 4.967702921 4.876357796 5.059048046 ZT16-19 2.1483053822500002 1.7544491435 2.542161621 ZT20-23 2.68409296425 2.4213648845 2.946821044