Table 2

Pooled estimate effect of dietary intervention during pregnancy on different outcomes

Outcomes

Studies

Comparison

groups

Participants

Statistical method

Effect size (95% CI)

I2


Total GWG

all data

10

11

1434

WMD (Random)

-1.92 kg (-3.65/- 0.19)

89%

excluding Thornton and Wolff

8

9

1152

WMD (Fixed)

-1.01 kg (-1.58/-0.45)

43%


Weekly GWG

2

2

253

WMD (Random)

-0.26 kg/wk (-0.42/-0.09)

82%


GW above IOM guidelines

4

4

629

RR (Fixed)

0.90 (0.77/1.05)

0%


Weight retention

6 wks postpartum

2

2

306

WMD (Fixed)

0.58 (0.13/1.03)

12%

6 mths postpatum

3

3

443

WMD (Random)

-1.90 (-2.69/-1.12)

63%


Preeclampsia

6

6

1025

WMD (Fixed)

0.78 (0.58/1.06)

0%


Gestational diabetes

6

6

886

WMD (Fixed)

0.74 (0.52/1.06)

31%


Cesarean section

all data

6

6

841

RR (Random)

0.82 (0.60/1.09)

61%

excluding Thornton

5

5

609

RR (Fixed)

0.75 (0.60/0.94)

0%


Mean birth weight

all data

7

8

1048

WMD (Random)

-34.8 g (-162.6/93.0)

77%

excluding Badrawi

6

7

949

WMD (Fixed)

34.5 g (-27.4/93.5)

0%


Low birth weight

2

2

531

RR (Fixed)

1.30 (0.8/2.10)

0%


Macrosomia

6

6

1023

RR (Fixed)

0.94 (0.62/1.35)

33%


Mean gestational age

7

8

1167

WMD (Fixed)

0.22 (0.01/0.42)

0%


Preterm birth

4

4

873

RR (Fixed)

0.83 (0.51/1.34)

0%


CI - confidence interval, GWG - gestational weight gain, IOM - Institute of Preventive Medicine, wks - weeks, mths - months WMD - weighted mean difference, RR - relative risk

Tanentsapf et al. BMC Pregnancy and Childbirth 2011 11:81   doi:10.1186/1471-2393-11-81

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