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Table 1 Characteristics of study participants according to quartiles of maternal serum brain-derived neurotrophic factor (BDNF, ng/mL) levels, PrOMIS Cohort Study, Lima, Peru, 2012

From: Association of decreased serum brain-derived neurotrophic factor (BDNF) concentrations in early pregnancy with antepartum depression

Characteristics

Serum brain- derived neurotrophic factor (BDNF, ng/ ml)

** P -value

Quartile 1

Quartile 2

Quartile 3

Quartile 4

(<17.32)

(17.32- 20.92)

(20.92- 25.31)

(>25.31)

N =  242

N =  242

N =  242

N =  242

n

%

n

%

n

%

n

%

Maternal age (years)*

26.4 ± 5.9

27.3 ± 6.3

28.7 ± 6.0

29.7 ± 6.4

0.001

Maternal age (years)

     

  18-20

26

10.7

20

8.3

8

3.3

6

2.5

0.091

  20-29

151

62.4

142

58.7

132

54.5

121

50.0

  30-34

34

14.0

41

16.9

58

24.0

59

24.4

  ≥35

31

12.8

39

16.1

44

18.2

56

23.1

Gestational age at Interview* (weeks)

10.96 ± 3.5

10.51 ± 3.31

9.6 ± 3.40

8.56 ± 3.11

0.48

Education (years)

        

  ≤6

10

4.1

7

2.9

10

4.2

11

4.5

0.42

  7-12

141

58.3

142

59.2

144

60.0

124

51.2

  >12

91

37.6

91

37.9

86

35.8

107

44.2

Hispanic Ethnicity

179

74.3

186

76.9

180

74.4

186

76.9

0.67

Married/living with partner

190

79.2

194

80.5

192

80.0

201

83.4

0.28

Employed

104

24.2

95

22.1

117

27.3

113

26.3

0.15

Access to basic foods

         

  Hard

127

52.5

136

56.2

119

49.2

130

53.7

0.82

  Not very hard

115

47.5

106

43.8

123

50.8

112

46.3

Nulliparous

134

55.4

124

51.2

125

51.7

100

41.3

0.004

Planned pregnancy

82

19.7

111

26.6

110

26.4

114

27.3

0.005

Early pregnancy body mass index (kg/m2)

         

  <25

143

59.8

136

56.7

107

44.6

93

38.6

0.026

  25-29.9

81

33.9

88

36.7

89

37.1

101

41.9

  ≥30

15

6.3

16

6.7

44

18.3

47

19.5

Illicit drug use during pregnancy

4

1.7

3

1.2

1

0.4

1

0.4

0.10

Smoked during pregnancy

13

5.4

16

6.8

7

2.9

8

3.3

0.09

Consumed alcohol during pregnancy

56

23.3

42

17.4

69

28.5

50

20.7

0.79

  1. Due to missing data, percentages may not add up to 100%.
  2. *Mean ± SD (standard deviation).
  3. **P-value of test of linear trend.