condition mean min max ZT0-3 1.4120141625000002 1.3238495270000001 1.500178798 ZT4-7 1.65917816425 1.450931819 1.8674245095 ZT8-11 2.5097259455 1.891072361 3.12837953 ZT12-15 5.1825571045 3.6404035695 6.7247106395 ZT16-19 9.20014598125 7.875238084 10.5250538785 ZT20-23 14.5864854725 12.862502379999999 16.310468565