condition mean min max ZT0-3 4.22477608425 3.581485775 4.8680663935 ZT4-7 8.317970442 7.1896424985 9.4462983855 ZT8-11 11.2828674275 9.2257433045 13.339991550499999 ZT12-15 9.32054887875 7.41381684 11.2272809175 ZT16-19 4.9598220265 4.820800950500001 5.0988431025 ZT20-23 4.22026801 3.4453147725 4.9952212475