condition mean min max ZT0-3 10.046415 10.046415 10.046415 ZT4-7 9.2855485 9.2855485 9.2855485 ZT8-11 9.771893 9.771893 9.771893 ZT12-15 10.395008 10.395008 10.395008 ZT16-19 9.448069499999999 9.448069499999999 9.448069499999999 ZT20-23 10.4618745 10.4618745 10.4618745