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Table 6 Descriptive statistics of dietary nitrate, nitrite, and nitrosamine intake and limb deficiency defects in offspring

From: Maternal dietary intake of nitrates, nitrites and nitrosamines and selected birth defects in offspring: a case-control study

    

N (%)

 

Limb deficiency defect

N

Mean (SD)

Quartile 1

Quartile 2

Quartile 3

Quartile 4

Nitrate (mg/day)

      
 

Longitudinal

245

47.12 (31.52)

73 (29.8)

55 (22.4)

60 (24.5)

57 (23.3)

 

Transverse

379

46.97 (33.93)

101 (26.6)

105 (27.7)

95 (25.1)

78 (20.6)

 

Intercalary

34

45.84 (24.04)

10 (29.4)

7 (20.6)

7 (20.6)

10 (29.4)

 

Preaxial*

143

45.19 (30.13)

46 (32.2)

32 (22.4)

34 (23.8)

31 (21.7)

Nitrite (mg/day)

      
 

Longitudinal

245

1.76 (0.96)

73 (29.8)

50 (20.4)

54 (22.0)

68 (27.8)

 

Transverse

379

1.80 (1.00)

95 (25.1)

102 (26.9)

86 (22.7)

96 (25.3)

 

Intercalary

34

1.86 (0.88)

5 (14.7)

9 (26.5)

7 (20.6)

13 (38.2)

 

Preaxial*

143

1.78 (1.02)

42 (29.4)

33 (23.1)

31 (21.7)

37 (25.9)

Animal Nitrite (mg/day)

      
 

Longitudinal

247

1.12 (0.79)

66 (26.7)

59 (23.9)

64 (25.9)

58 (23.5)

 

Transverse

381

1.12 (0.77)

99 (26.0)

94 (24.7)

90 (23.6)

98 (25.7)

 

Intercalary

34

1.26 (0.82)

5 (14.7)

7 (20.6)

9 (26.5)

13 (38.2)

 

Preaxial*

145

1.15 (0.87)

38 (26.2)

37 (25.5)

36 (24.8)

34 (23.4)

Plant Nitrite (mg/day)

      
 

Longitudinal

247

0.64 (0.36)

64 (25.9)

63 (25.5)

56 (22.7)

64 (25.9)

 

Transverse

381

0.68 (0.42)

101 (26.5)

89 (23.4)

83 (21.8)

108 (28.3)

 

Intercalary

34

0.60 (0.29)

8 (23.5)

9 (26.5)

10 (29.4)

7 (20.6)

 

Preaxial*

145

0.63 (0.34)

37 (25.5)

39 (26.9)

33 (22.8)

36 (24.8)

Nitrosamine (μg/day)

      
 

Longitudinal

245

0.56 (0.46)

65 (26.5)

62 (25.3)

55 (22.4)

63 (25.7)

 

Transverse

380

0.82 (5.82)

100 (26.3)

99 (26.1)

91 (23.9)

90 (23.7)

 

Intercalary

34

0.63 (0.30)

4 (11.8)

9 (26.5)

11 (32.4)

10 (29.4)

 

Preaxial*

143

0.52 (0.31)

41 (28.7)

34 (23.8)

33 (23.1)

35 (24.5)

  1. * Subcategory of longitudinal limb deficiency.