condition mean min max ZT0-3 0.2701401315 0.229040034 0.311240229 ZT4-7 0.46995810849999997 0.3195568865 0.6203593304999999 ZT8-11 0.8623776885000001 0.7354122105 0.9893431665 ZT12-15 0.628292399 0.5871791635 0.6694056344999999 ZT16-19 0.6860349575 0.5576149705 0.8144549445000001 ZT20-23 1.06132186275 0.834427851 1.2882158745