condition mean min max ZT0-3 4.51689538175 3.5620763845 5.471714379 ZT4-7 2.37102311675 2.24166315 2.5003830835 ZT8-11 3.8587289260000004 2.912801733 4.804656119000001 ZT12-15 3.5758288055000005 3.3488631825 3.8027944285000004 ZT16-19 4.8031395825 4.7866649765 4.8196141885 ZT20-23 7.9032923969999995 7.154805083499999 8.6517797105