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Table 2 Final search strategy with numbers of citations identified by MEDLINE for each combination of terms

From: Searching for health equity: validation of a search filter for ethnic and socioeconomic inequalities in transport

1

(equit* or inequit* or inequalit* or disparit* or equality).tw.

85,758

2

(ethnic* or race or racial* or racis*).tw.

184,410

3

((social* or socio-economic or socioeconomic or economic or structural or material) adj3 (advantage* or disadvantage* or exclude* or exclusion or include* or inclusion or status or position or gradient* or hierarch* or class* or determinant*)).tw.

91,032

4

(health adj3 (gap* or gradient* or hierarch*)).tw.

2377

5

Vulnerable populations/ or socioeconomic factors/ or poverty/ or social class/ or Healthcare Disparities/ or Health Status Disparities/ or Poverty areas/ or Urban population/

241,519

6

(SES or SEP or sociodemographic* or socio-demographic* or income or wealth* or poverty or educational level or level of education or educational attainment or well educated or better educated or unemploy* or home owner* or tenure or affluen* or well off or better off or worse off).tw.

204,500

7

or/1–6

618,121

8

(automobile* or auto use* or car or cars or motori#ed. transport* or motorist* or road user* or motor vehicle* or vkt* or vmt* or vehicle kilomet* or vehicle mile*).tw.

38,786

9

(pedestrian* or cyclist* or bicyclist* or bicycling or bik* or bus or buses or busing or busing or trains or rail or railway orpublic transport* or nonmotori#ed. transport or non-motori#ed. transport or active travel* or active transportation).tw.

29,491

10

motor vehicles/ or walking/ or bicycling/

36,909

11

(travel mode* or mod* shift or travel behav*).tw.

527

12

(transport or transportation or travel* or traffic or road* or congestion or fuel or gasoline or parking or commut*).tw.

469,683

13

or/8–12

549,581

14

(polic* or plan or plans or planning or intervention or experiment or trial or program* or tax* or charg* or initiative* or pric* or subsid* or promot* or campaign* or evaluation or evaluating or implementation or implementing or infrastructure or modelling or modelling or impact assessment or cost-benefit analysis).tw. or health impact assessment/

4,017,557

15

13 and 14

113,133

16

7 and 15

8170

  1. Note: the symbol * is a wildcard