condition mean min max ZT0-3 9.830728 9.830728 9.830728 ZT4-7 11.2323395 11.2323395 11.2323395 ZT8-11 9.534746 9.534746 9.534746 ZT12-15 9.204278500000001 9.204278500000001 9.204278500000001 ZT16-19 10.817083 10.817083 10.817083 ZT20-23 9.833913500000001 9.833913500000001 9.833913500000001