Table 1 Search strategy utilised for MEDLINE 1946 to January 2012

1

Pregnancy Complications/OR Pregnancy/OR Pregnancy Outcome/OR Pregnancy, High Risk/

646,055

2

Prenatal Care/OR Pregnancy/OR Pregnancy Complications

647,726

3

Antenatal.mp.

18,393

4

Gestation intervention.mp.

4

5

1 OR 2 OR 3 OR 4

651,321

6

Overweight.mp. OR Obesity/OR Overweight/OR Body Weight/

249,097

7

Obesity/OR Obesity, Morbid/or Obesity.mp.

145,882

8

Body Weight/OR Obesity/OR Body Mass Index/or BMI.mp. OR Overweight/

293,584

9

6 OR 7 OR 8

328,089

10

5 AND 9

21,583

11

Diet, Fat-Restricted/OR Diet/OR Diet, Protein-Restricted/OR Diet, Carbohydrate-Restricted/OR Diet.mp. OR Diet, Reducing/OR Diet Therapy/

255,985

12

Life Style/

36,837

13

Health Education/

48,625

14

Patient Education as Topic/

63,238

15

Exercise.mp. OR Exercise/OR Exercise, Therapy/

192,937

16

Health Promotion/

43,967

17

Weight Loss/

19,434

18

11 OR 12 OR 13 OR 14 OR 15 OR 16 OR 17

601,919

19

10 AND 18

3,769

20

LIMIT 19 TO ((female or humans or pregnancy) and (clinical trial, all OR clinical trial, phase i OR clinical trial, phase ii OR clinical trial, phase iii OR clinical trial, phase iv OR clinical trial OR controlled clinical trial OR randomized controlled trial))

154