Clusters of galaxies contain a fair sample of the universal baryonic mass fraction .
A combined analysis of the intracluster medium ( ICM ) within their hydrostatic regions , as derived from both Sunyaev-Zeldovich effect ( SZE ) measurements and X-ray images , makes it possible to constrain the cosmological parameters .
We consider both gas fraction estimates and angular diameter distance measurements .
Adopting median statistics , we find , at the 2- \sigma level , the pressureless matter density , \Omega _ { M 0 } , to be between 0.30 and 0.40 and the Hubble constant , H _ { 0 } , between 44 and 66 Km s ^ { -1 } Mpc ^ { -1 } .