condition mean min max ZT0-3 16.706735000000002 9.882505 21.505650000000003 ZT4-7 6.399315 6.399315 6.399315 ZT8-11 4.158075 4.158075 4.158075 ZT12-15 9.2019225 4.676394999999999 13.727450000000001 ZT16-19 14.271 14.271 14.271 ZT20-23 18.336550000000003 18.336550000000003 18.336550000000003