condition mean min max ZT0-3 7.001289720500001 6.529130029 7.473449412000001 ZT4-7 8.901633065999999 6.509023431999999 11.2942427 ZT8-11 11.399774396249999 10.890342302499999 11.909206489999999 ZT12-15 7.00071018525 5.9311386255 8.070281744999999 ZT16-19 7.1983220635 6.2843214055 8.1123227215 ZT20-23 13.02496844 11.781891895000001 14.268044985