Table 1 Socio-demographic and pre-pregnancy health related predictors of alcohol consumption among pregnancies in Northern Tanzania

Total (n = 33006)^(b)

100.0

34.1

Mother's age in years (n = 32985)

< 0.001

0.001

 17 or younger

2.6

17.4

0.41 (0.35 – 0.48)

0.83 (0.66 – 1.03)

 18 – 25

38.9

28.3

0.67 (0.64 – 0.70)

0.93 (0.86 – 1.00)

 26 – 35

48.2

37.9

0.89 (0.85 – 0.93)

1.02 (0.97 – 1.08)

 36 or older

10.3

42.5

1.00

1.00

Number of previous pregnancies (n = 32029)

< 0.001

< 0.001

 0

37.0

26.7

0.65 (0.62 – 0.68)

0.82 (0.77 – 0.87)

 1

26.4

36.2

0.88 (0.84 – 0.92)

1.00 (0.95 – 1.05)

 2

17.3

41.8

1.02 (0.97 – 1.06)

1.09 (1.04 – 1.15)

 3 or more

19.3

41.1

1.00

1.00

Mother's tribe (n = 32961)

< 0.001

< 0.001

 Chagga

55.8

45.2

2.07 (1.99 – 2.16)

1.34 (1.27 – 1.41)

 Pare

12.6

17.3

0.79 (0.74 – 0.86)

0.92 (0.84 – 1.01)

 Maasai

1.0

6.6

0.31 (0.21 – 0.45)

0.88 (0.57 – 1.35)

 Other

30.6

21.8

1.00

1.00

Mother's religion (n = 32783)

< 0.001

< 0.001

 Catholic

38.6

53.6

3.62 (3.41 – 3.84)

2.91 (2.69 – 3.14)

 Protestant

40.0

25.9

1.75 (1.64 – 1.87)

1.59 (1.47 – 1.72)

 Muslim

21.4

14.8

1.00

1.00

Mother's Body Mass Index before pregnancy (n = 25417)

< 0.001

< 0.001

 < 18.5 Underweight

5.2

23.8

0.58 (0.50 – 0.67)

0.71 (0.62 - 0.82)

 18.5 – 24.9 Normal weight

56.8

33.7

0.82 (0.73 – 0.91)

0.86 (0.77 - 0.96)

 25.0 – 29.9 Overweight

26.9

41.5

1.01 (0.90 – 1.13)

0.95 (0.85 - 1.06)

 30.0 – 34.9 Obese Class 1 (Moderately Obese)

9.3

44.3

1.07 (0.95 – 1.21)

0.97 (0.87 - 1.09)

 ≥ 35.0 Obese Class 2 (Severely Obese)

1.8

41.3

1.00

1.00

Mother's height (n = 29314)

< 0.001

0.001

 < 150 cm

5.5

26.7

0.67 (0.60 – 0.73)

0.81 (0.73 – 0.90)

 150 – 159 cm

41.3

33.8

0.84 (0.79 – 0.89)

0.92 (0.86 – 0.97)

 160 – 169 cm

45.9

36.8

0.92 (0.87 – 0.97)

0.91 (0.86 – 0.97)

 ≥170 cm

7.3

40.2

1.00

1.00

Current residence (n = 32913)

< 0.001

0.001

 Urban area

52.2

34.4

1.00 (0.97 – 1.04)

1.07 (1.03 – 1.11)

 Semiurban area

4.8

28.5

0.83 (0.77 – 0.90)

1.01 (0.92 – 1.11)

 Rural area

43.0

34.3

1.00

1.00

HIV status (n = 33006)

< 0.001

< 0.001

 Negative

59.4

28.9

0.69 (0.67 – 0.71)

0.91 (0.87 – 0.95)

 Positive

3.9

39.3

0.94 (0.87 – 1.00)

1.11 (1.01 – 1.21)

 Unknown

36.7

42.0

1.00

1.00

Father's age (n = 32745)

< 0.001

< 0.001

 25 or younger

15.1

25.7

0.60 (0.56 – 0.65)

0.82 (0.74 – 0.91)

 26 – 35

55.2

33.0

0.77 (0.73 – 0.83)

0.85 (0.79 – 0.92)

 36 – 45

25.6

40.5

0.95 (0.89 – 1.02)

0.93 (0.86 – 1.00)

 46 or older

4.2

42.6

1.00

1.00

Father's tribe (n = 32835)

< 0.001

< 0.001

 Chagga

50.3

45.3

1.85 (1.79 – 1.92)

1.24 (1.19 – 1.30)

 Pare

12.5

19.2

0.78 (0.73 – 0.84)

0.94 (0.87 – 1.03)

 Maasai

1.4

13.6

0.56 (0.44 – 0.70)

1.00 (0.78 – 1.30)

 Other

35.8

24.5

1.00

1.00

Year (n = 33006)

< 0.001

< 0.001

 2000

4.8

49.5

2.30 (2.12 – 2.49)

1.88 (1.68 – 2.11)

 2001

10.1

44.7

2.08 (1.93 – 2.24)

1.86 (1.68 – 2.07)

 2002

9.1

44.9

2.09 (1.94 – 2.25)

1.86 (1.68 – 2.07)

 2003

8.1

44.2

2.06 (1.90 – 2.22)

1.72 (1.55 – 1.91)

 2004

8.5

39.1

1.82 (1.68 – 1.97)

1.58 (1.42 – 1.76)

 2005

8.6

34.9

1.62 (1.49 – 1.76)

1.49 (1.34 – 1.66)

 2006

8.9

32.0

1.49 (1.37 – 1.62)

1.46 (1.31 – 1.62)

 2007

9.8

28.5

1.33 (1.22 – 1.44)

1.25 (1.12 – 1.40)

 2008

10.9

26.2

1.22 (1.12 – 1.33)

1.20 (1.08 – 1.34)

 2009

10.8

23.3

1.08 (0.99 – 1.18)

1.02 (0.92 – 1.15)

 2010

10.4

21.5

1.00

1.00