2.Subjects
Four thousand Chinese men and women aged sixty five years and older were recruited for a study on osteoporosis in Hong Kong. Recruitment notices were placed in community centers for elderly people and housing estates.
The purpose,procedures, and investigations to be performed in the study were explained in several talks. Subjects were volunteers, and it was aimed to recruit a stratified sample so that approximately 33% each were aged 65 to 69, 70 to 74, and 75 and older. Subjects who had bilateral hip replacements or unable to walk independently were excluded. The study sample differed from the general Hong Kong population of the same age group in that they were more educated and more likely to be married.