Table 1 Association between gestational weight gain and risk of autism spectrum disorders: Method of the database search strategy using PubMed, SCOPUS, Google Scholar and Embase

PubMed

#1 (((gestational weight gain [Title/Abstract]) OR (pregnancy weight gain [Title/Abstract])) OR (weight gain in pregnancy[Title/Abstract])) OR (weight gain during pregnancy[Title/Abstract])

4323

#2 (((autism[Title/Abstract]) OR (ASD[Title/Abstract])) OR (developmental delay[Title/Abstract])) OR (developmental disorder[Title/Abstract])

64,806

#1 combined with #2 ((((gestational weight gain[Title/Abstract]) OR (pregnancy weight gain[Title/Abstract])) OR (weight gain in pregnancy[Title/Abstract])) OR (weight gain during pregnancy[Title/Abstract])) AND ((((autism[Title/Abstract]) OR (ASD[Title/Abstract])) OR (developmental delay[Title/Abstract])) OR (developmental disorder[Title/Abstract]))

15

SCOPUS

(TITLE-ABS-KEY (“gestational weight gain”) OR TITLE-ABS-KEY (“pregnancy weight gain”) OR TITLE-ABS-KEY (“weight gain in pregnancy”) OR TITLE-ABS-KEY (“weight gain during pregnancy”) AND TITLE-ABS-KEY (“autism”) OR TITLE-ABS-KEY (“ASD”) OR TITLE-ABS-KEY (“developmental delay”) OR TITLE-ABS-KEY (“developmental disorder”)) AND DOCTYPE (ar)

24

Google Scholar

allintitle: “autism” OR “ASD” OR “developmental delay” OR “developmental disorder” “weight gain”

24

with at least one of the words: “autism” OR “ASD” OR “developmental delay” OR “developmental disorder”

with the exact phrase: weight gain

Embase

#1 ‘gestational weight gain’/exp. OR ‘pregnancy weight gain’/exp. OR ‘weight gain in pregnancy’ OR ‘weight gain during pregnancy’

4356

#2 ‘autism’/exp. OR ‘asd’/exp. OR ‘developmental delay’/exp. OR ‘developmental disorder’/exp.

139,670

#1 AND #2

28

Cochrane library

#1 (“gestational weight gain”):ti,ab,kw OR (“pregnancy weight gain”):ti,ab,kw OR (“weight gain in pregnancy”):ti,ab,kw OR (“weight gain during pregnancy”):ti,ab,kw

791

#2 (“autism”):ti,ab,kw OR (“autism spectrum disorder”):ti,ab,kw OR (“ASD”):ti,ab,kw OR (“developmental delay”):ti,ab,kw OR (“developmental disorder”):ti,ab,kw

4481

#1 AND #2

1

Total

92