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. Author manuscript; available in PMC: 2022 Apr 1.
Published in final edited form as: Ann Epidemiol. 2021 Jan 22;56:18–25. doi: 10.1016/j.annepidem.2021.01.003

Table 1.

Descriptive Characteristics of Analytic Sample, Framingham Heart Study.

N
 Mean (or %)
 N
 Mean (or %)
Original cohort Offspring cohort
Time-invariant variables (N=4,576 individuals) Time-invariant variables (N=3,753 individuals)
Birth cohorts Birth cohorts
 1876 to 1894 524 11.45%  1903 to 1924 500 13.32%
 1895 to 1899 676 14.77%  1925 to 1929 539 14.36%
 1900 to 1904 690 15.08%  1930 to 1934 571 15.21%
 1905 to 1909 818 17.88%  1935 to 1939 536 14.28%
 1910 to 1914 920 20.10%  1940 to 1944 676 18.01%
 1915 and above 948 20.72  1945 to 1949 555 14.79%
 1950 and above 376 10.02%
Gender Gender
 Male 2,079 45.43%  Male 1,813 48.31%
 Female 2,497 54.57%  Female 1,940 51.69%
Educational attainment Years of education
 Less than high school 1,930 42.18%  0-11 292 7.78%
 High school graduate 1,358 29.68%  12 1,293 34.45%
 Some college 713 15.58%  13-15 1,007 26.83%
 College graduate 575 12.57%  16 and above 1,161 30.94%
Time-variant variables (N=44,261 observations) Time-variant variables (N=19,067 observations)
BMIab 39,736 26.12 BMIab 18,822 27.01
Body type categoriesa Body type categoriesa
 Underweightc 601 1.51%  Underweightc 158 0.84%
 Normal weightd 16,428 41.34%  Normal weightd 6,860 36.45%
 Overweighte 16,503 41.53%  Overweighte 7,597 40.36%
 Class I obesityf 4,941 12.43%  Class I obesityf 3,030 16.10%
 Class II/III obesityg 1,263 3.18%  Class II/III obesityg 1,177 6.25%
Age 44,261 64.73 Age 19,067 53.56
Smoking behavior Smoking behavior
 Non-smoker 29,805 67.34%  Non-smoker 14,680 76.99%
 Low smoking (1-9 cigarettes) 2,842 6.42%  Low smoking (1-9 cigarettes) 636 3.34%
 Moderate smoking (10-19 cigarettes) 3,072 6.94%  Moderate smoking (10-19 cigarettes) 770 4.04%
 Heavy smoking (20 or more cigarettes) 8,542 19.30%  Heavy smoking (20 or more cigarettes) 2,981 15.63%
Disease index 44,261 70.20% Disease index 19,067 80.20%
a

Total sample size is different because this variable was constructed using reported BMIs (Original N=39,736; Offspring N=18,822)

b

Weight(kg)/height(m)2

c

Underweight was defined as having less than 18.5 kg/m2

d

Normal weight was defined as having a BMI between 18.5 and 24.9 kg/m2

e

Overweight was defined as having a BMI between 25 and 29.9 kg/m2

f

Class I obesity was defined as having a BMI between 30 and 34.9 kg/m2

g

Class II/III obesity was defined as having a BMI greater than or equal to 35 kg/m2