Table 2 Mean values of BMI at different ages and of BMI changes by categories of current BMI among controls

Mean current BMI (kg/m2) (sd)

22.0 (1.9)

27.2 (1.4)

34.2 (4.2)

<10^-4

1.00

Mean BMI at age 50 (kg/m2) (sd)

21.4 (2.3)

24.7 (2.6)

29.8 (4.6)

<10^-4

0.79

Mean BMI at age 20 (kg/m2) (sd)

20.1 (2.3)

20.9 (2.6)

22.5 (3.2)

<10^-4

0.32

Mean BMI change from age 20 to current age (kg/m2) (sd)

1.9 (2.8)

6.3 (2.9)

11.8 (5.1)

<10^-4

0.86

Mean BMI change from age 20 to 40 (kg/m2) (sd)

0.6 (2.4)

2.3 (2.3)

4.6 (4.7)

<10^-4

0.54

Mean BMI change from age 40 to 50 (kg/m2) (sd)

0.6 (1.7)

1.5 (2.2)

2.9 (4.4)

<10^-4

0.32

Mean BMI change from age 50 to current age (kg/m2) (sd)

0.6 (2.0)

2.5 (2.5)

4.5 (4.7)

<10^-4

0.55