Table 3

Foods most predictive of inter-individual variation in dietary folate, and their correlation coefficients with intake from DR.

Foods selected by regression analysis1

Male and female

Male

Female

Partial

Cumulative

Cohort I (internal)

Cohort II (external)

Cohort I (internal)

Cohort II (external)

R-Square1

R-Square1

Cumulative

Spearman3

Cumulative

Spearman3

Cumulative

Spearman3

Cumulative

Spearman3

mean intake

correlation

mean intake

correlation

mean intake

correlation

mean intake

correlation

μg/day

(%)2

μg/day

(%)2

μg/day

(%)2

μg/day

(%)2


Green tea (sencha)

0.096

0.096

72

(15.3)

0.31

55

(13.0)

0.28

55

(11.6)

0.17

66

(14.6)

0.25

Dried small fish

0.070

0.166

73

(15.4)

0.33

55

(13.1)

0.27

56

(11.7)

0.19

67

(14.7)

0.26

Horse mackerel, sardine

0.039

0.204

74

(15.7)

0.37

57

(13.5)

0.27

57

(12.0)

0.20

68

(15.0)

0.24

Cake

0.031

0.236

74

(15.7)

0.37

57

(13.6)

0.27

58

(12.1)

0.19

69

(15.1)

0.24

Miso soup

0.030

0.266

84

(17.8)

0.37

62

(14.8)

0.28

66

(13.8)

0.24

73

(16.1)

0.27

Luncheon Meat

0.032

0.298

84

(17.8)

0.38

62

(14.8)

0.28

66

(13.8)

0.24

73

(16.1)

0.27

Ham, loin

0.022

0.320

84

(17.8)

0.38

62

(14.8)

0.29

66

(13.8)

0.24

73

(16.1)

0.27

Cream for coffee

0.014

0.335

85

(17.9)

0.37

63

(14.9)

0.28

66

(13.9)

0.24

74

(16.2)

0.27

Stewed pork, Western style

0.012

0.346

85

(17.9)

0.37

63

(15.0)

0.28

66

(14.0)

0.24

74

(16.2)

0.27

Mayonnaise

0.011

0.357

85

(17.9)

0.37

63

(15.0)

0.28

66

(14.0)

0.24

74

(16.2)

0.27

Worcester sauce

0.013

0.370

85

(17.9)

0.37

63

(15.0)

0.28

66

(14.0)

0.24

74

(16.2)

0.27

Kamaboko (fish paste product)

0.014

0.384

85

(18.0)

0.37

63

(15.0)

0.28

67

(14.0)

0.24

74

(16.3)

0.27

Lettuce

0.011

0.395

86

(18.3)

0.37

64

(15.3)

0.30

68

(14.3)

0.25

75

(16.5)

0.27

Bean sprouts

0.015

0.410

88

(18.7)

0.37

66

(15.7)

0.29

71

(14.9)

0.23

77

(16.9)

0.26

Peaches

0.017

0.427

89

(18.7)

0.38

66

(15.8)

0.29

71

(14.9)

0.23

77

(17.0)

0.26

Sausage, Wieners

0.011

0.437

89

(18.7)

0.38

66

(15.8)

0.29

71

(14.9)

0.23

77

(17.0)

0.26

Chocolate

0.009

0.446

89

(18.8)

0.38

67

(15.9)

0.29

71

(15.0)

0.23

78

(17.1)

0.26

Octopus

0.008

0.455

89

(18.8)

0.38

67

(15.9)

0.29

71

(15.0)

0.23

78

(17.1)

0.26

Salted fish

0.008

0.463

90

(19.1)

0.38

68

(16.0)

0.30

73

(15.2)

0.23

78

(17.2)

0.26

Apples

0.010

0.473

92

(19.5)

0.38

69

(16.3)

0.31

75

(15.8)

0.24

80

(17.6)

0.26

Sweet pepper

0.012

0.485

94

(19.8)

0.39

70

(16.6)

0.31

77

(16.1)

0.26

81

(17.9)

0.27

Udon

0.011

0.496

95

(20.0)

0.39

71

(17.0)

0.30

78

(16.3)

0.25

82

(18.1)

0.27

Grilled chicken

0.014

0.510

95

(20.1)

0.39

72

(17.1)

0.30

78

(16.4)

0.25

83

(18.2)

0.27

Pickled plums

0.009

0.519

95

(20.1)

0.39

72

(17.1)

0.30

78

(16.4)

0.25

83

(18.2)

0.27

Papaya

0.009

0.528

96

(20.2)

0.39

73

(17.3)

0.29

79

(16.5)

0.25

83

(18.4)

0.27

Black tea

0.007

0.536

96

(20.4)

0.39

73

(17.4)

0.30

79

(16.7)

0.24

84

(18.5)

0.28

Green tea (bancha, genmaicha)

0.007

0.542

105

(22.1)

0.42

83

(19.8)

0.33

88

(18.6)

0.25

95

(21.0)

0.35

Chicken liver

0.007

0.550

122

(25.8)

0.45

98

(23.2)

0.32

101

(21.2)

0.28

107

(23.6)

0.34

Bananas

0.008

0.557

126

(26.6)

0.46

101

(24.1)

0.32

104

(21.9)

0.27

111

(24.3)

0.34

Rice mixed with other grains

0.005

0.562

128

(27.1)

0.45

103

(24.5)

0.33

107

(22.5)

0.27

112

(24.8)

0.34

Well-milled rice

0.011

0.573

152

(32.2)

0.49

124

(29.5)

0.30

125

(26.2)

0.29

128

(28.3)

0.34

Yushi-dofu

0.006

0.579

153

(32.3)

0.49

125

(29.6)

0.30

125

(26.3)

0.29

129

(28.4)

0.34

Bitter gourds

0.011

0.590

158

(33.3)

0.46

128

(30.5)

0.30

130

(27.2)

0.28

132

(29.1)

0.35


1 Foods were selected by stepwise regression analysis using data from the food frequency questionnaire of Cohort I men and women. Partial and cumulative R-Square values were calculated in the process of performing the regression analysis.

2 Percent of total folate according to the food frequency questionnaire.

3 Spearman's correlation coefficients between cumulative intake and total intake based on dietary records

Ishihara et al. Nutrition Journal 2005 4:26   doi:10.1186/1475-2891-4-26

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