condition mean min max ZT0-3 1.25630219 0.42073254299999996 2.0918718370000002 ZT4-7 5.12537048175 5.0858310445 5.164909918999999 ZT8-11 7.69700056475 6.1807383245 9.213262805 ZT12-15 13.3496830775 11.395261235 15.30410492 ZT16-19 11.8924923525 11.767928085000001 12.01705662 ZT20-23 10.014295012 9.9429888115 10.0856012125