condition mean min max ZT0-3 12.98251 12.98251 12.98251 ZT4-7 16.399266500000003 16.399266500000003 16.399266500000003 ZT8-11 14.583601999999999 14.583601999999999 14.583601999999999 ZT12-15 13.9680605 13.9680605 13.9680605 ZT16-19 13.3179295 13.3179295 13.3179295 ZT20-23 15.090489 15.090489 15.090489