Table 4

Factors associated with serum retinol changes in Bogandé pupils (ANCOVA with repeat measures)

Within subject effects


Source

Sum of squares

df

F

p


Time factor (T0 – T1)

0.78

1

12.60

<0.001

Time factor* age

1.45

23.50

<0.001

Time factor * height-for-age Z-score

0.42

1

6.87

0.009

Time factor * sex

0.10

1

1.65

0.20

Time factor * treatment (school group)

1.09

2

8.86

<0.001

Time factor *sex * school group

0.99

2

0.84

0.48

Error

20.34

329

-

-

Between subject effects

Age in months

3.75

1

32.20

<0.001

Height-for-age Z-score

0.99

1

8.50

0.004

Sex

0.14

1

1.20

0.30

Treatment (school group)

0.82

2

3.54

0.030

Sex * school group

0.08

2

0.36

0.70

Error

38.39

329

-

-


Zeba et al. Nutrition Journal 2006 5:17   doi:10.1186/1475-2891-5-17

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