1. Current Estimates from the National Health Interview Survey: United States, 1979;National Center for Health Statistics,1981
2. Health Characteristics of Persons with Chronic Activity Limitation: United States, 1979;National Center for Health Statistics,1981
3. Limitation of Activity and Mobility Due to Chronic Conditions: United States, 1972;National Center for Health Statistics,1974
4. Limitation of Activity Due to Chronic Conditions: United States, 1974;National Center for Health Statistics,1977
5. Current Estimates from the National Health Interview Survey: United States, 1980;National Center for Health Statistics,1981