condition mean min max ZT0-3 2.47289589625 2.0976182355 2.848173557 ZT4-7 1.4732826945 1.455483061 1.491082328 ZT8-11 1.4715069567499999 1.4118058545 1.531208059 ZT12-15 1.62178575175 1.583092089 1.6604794145 ZT16-19 1.6934881124999999 1.4427702835 1.9442059415 ZT20-23 2.1343394655 1.747925796 2.520753135