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Table 3 Parameter estimates for the regression of the slope and intercept of the growth line on subjects’ baseline characteristics

From: Obesity trends and risk factors in the South African adult population

 

Slope [kg/m2 per decade]

 

Intercept [kg/m2]

      

Independent variable

Coefficient

95 % CI

 

Coefficient

95 % CI

      

Sex

           

Male vs female

1.91

(−2.93 ; −0.00)

 

1.54

(−1.88 ; −1.21)

      

Age

           

10 year increase

0.90

(−1.20 ; −0.50)

 

−0.03

(−0.15 ; 0.09)

      

Race

           

Coloured vs. Black

−0.51

(−1.98 ; 0.96)

 

−0.44

(−0.90 ; 0.03)

      

White vs. Black

2.58

(0.46 ; 4.71)

 

−0.35

(−1.30 ; 0.60)

      

Asian vs. Black

0.05

(−1.13 ; 1.0)

 

0.85

(−1.36 ; -0.33)

      

Education

           

None vs. primary

−0.18

(−1.69 ; 1.34)

 

−0.27

(−0.75 ; 0.21)

      

Secondary vs. primary

−0.05

(−1.13 ; 1.04)

 

0.17

(−0.19 ; 0.53)

      

Tertiary vs. primary

0.67

(−0.82 ; 2.16)

 

0.17

(−0.38 ; 0.72)

      

Income Quintile

           

I vs. III

0.00

(−1.26 ; 1.26)

 

−0.18

(−0.60 ; 0.25)

      

II vs. III

0.51

(−0.84 ; 1.86)

 

−0.16

(−0.58 ; 0.25)

      

IV vs. III

1.28

(−0.08 ; 2.64)

 

−0.26

(−0.63 ; 0.10)

      

V vs. III

1.59

(0.41 ; 2.78)

 

−0.21

(−0.58 ; 0.17)

      

Residence

           

Rural vs. urban

1.16

(0.02 ; 2.31)

 

0.44

(−0.78 ; −0.09)

      

Exercise Frequency

           

Moderate vs. low

−0.14

(−1.50 ; 1.21)

 

0.35

(−0.04 ; 0.73)

      

High vs. low

1.52

(−2.78 ; −0.25)

 

0.75

(0.36 ; 1.15)

      

Alcohol use

−0.14

(−1.10 ; 0.81)

 

−0.22

(−0.51 ; 0.07)

      

Smoking

1.69

(−3.00 ; −0.38)

 

−0.20

(−0.60 ; 0.21)

      

Waist circumference

           

10 cm increase

0.70

(0.20 ; 1.2)

 

1.54

(1.29 ; 1.79)

      

BMI class

           

Overweight/Obese vs.

7.99

(−9.77 ; −6.21)

 

7.23

(6.58 ; 7.96)

      

Normal/Underweight

           

Rural x BMI class

1.98

(−3.80 ; −0.16)

 

0.01

(−0.60 ; 0.58)

      

Moderate Exercise x BMI class

0.92

(−1.35 ; 3.18)

 

1.10

(−1.88 ; −0.33)

      

High Exercise x BMI class

1.96

(−0.43 ; 4.35)

 

1.43

(−2.22 ; −0.63)

      
  1. CI = Confidence Interval. Statistically significant coefficients in italic