condition mean min max ZT0-3 0.757723733 0.595983072 0.919464394 ZT4-7 1.243704065 1.1345055240000002 1.3529026059999998 ZT8-11 1.806772069 1.3877934305 2.2257507075 ZT12-15 3.6806035670000004 2.8637676990000003 4.497439435 ZT16-19 3.9220050882499997 3.401281231 4.4427289455 ZT20-23 4.284509052 4.1309880825 4.4380300214999995