condition mean min max ZT0-3 0.267518394 0.225073733 0.309963055 ZT4-7 1.4414882354999998 0.738750315 2.1442261559999998 ZT8-11 2.7884154005 2.528532161 3.04829864 ZT12-15 0.7065706475 0.1998333445 1.2133079505 ZT16-19 0.29942397924999997 0.1894024445 0.40944551399999995 ZT20-23 0.354309196 0.19872286 0.509895532