Table 16. Metropolitan Mobility of Married-Couple Family Householders, by Age of Householder, Family Income, and (MOBILITY DATA FROM MARCH 1980 TO MARCH 1981. NUMBERS IN THOUSANDS. FOR MEANING OF SYMBOLS, SEE TEXT) Table 17. Central-City Mobility of Married-Couple Family Householders, by Age of Householder, Family Income, and Number of Own Children Under 18 (MOBILITY DATA FROM MARCH 1980 TO MARCH 1981. NUMBERS IN THOUSANDS. FOR MEANING OF SYMBOLS, SEE TEXT) HOUSEHOLDER 15 TO 24 YEARS OLD NO OWN CHILDREN... ONE OWN CHILD...... TWO OWN CHILDREN THREE OWN CHILDREN. FOUR OR MORE OWN CHILDREN. ONE OWN CHILD... TWO OWN CHILDREN FOUR OR MORE OWN CHILDREN. MEAN NUMBER OF OWN CHILDREN. ONE OWN CHILD.. FOUR OR MORE OWN CHILDREN. (8) 42221 Table 17. Central-City Mobility of Married-Couple Family Householders, by Age of Householder, Family Income, and Number of Own Children Under 18-Continued (MOBILITY DATA FROM MARCH 1980 TO MARCH 1981. NUMBERS IN THOUSANDS. FOR MEANING OF SYMBOLS, SEE TEXT) BALANCE SAME BETWEEN CENTRAL ་,་,་ |