A very small fraction of Czechoslovakia's pre–World War II Jewish community remained in the 1980s. Estimates of both the prewar and the postwar Jewish population are imprecise. Calculations based on either religious preference or the number of Yiddish speakers ignored the large numbers of assimilated Jews in Bohemia and Slovakia. Most estimates put the pre–World War II population in the neighborhood of 250,000. In 1975 Malcolm Browne stated that there were some 5,000 practicing Jews remaining in Czechoslovakia, including about 1,200 in Prague, which once had a large, vibrant Jewish community dating back to the Middle Ages.