condition mean min max ZT0-3 10.258401958499999 8.081089417 12.4357145 ZT4-7 4.0262848485 3.7040097555 4.3485599415 ZT8-11 3.481111342 3.415484203 3.5467384809999998 ZT12-15 2.6213631275 2.455282693 2.787443562 ZT16-19 4.6204639817499995 3.679033177 5.5618947865 ZT20-23 7.7220241205 7.336373865500001 8.1076743755