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Table 2 Summary of the key characteristics of included studies

From: The effect of changing the built environment on physical activity: a quantitative review of the risk of bias in natural experiments

Author (date)

Study location

Research design

Type of intervention (total cost)

Physical activity outcomesa (level of data)

Sample size

Number/type of control sites

Branas et al. [37]

US

Repeated cross-sectional

Greening of 4,436 abandoned vacant lots over 725,000 m2(cost not reported)

Self-report survey (individual-level)

No exact count provided

13,308 matched control lots at a ratio of 3:1 per treated lot

Cohen et al. [38]

US

Mixed

5 parks, ranging from 3.4 to 16 acres, underwent major improvements (Over $1 million budget per park)

1) Systematic observation using SOPARC (population-level)

2) Self-report household interviews (indivudal-level)

3) Self-report intercept interviews (individual-level)

1) 3,500 park users

2) 1,480 park users

3) 1,387 household residents

5 matched control parks

Cohen et al. [39]

US

Repeated cross-sectional

A skate park ($3.5 million) and a senior citizen’s centre ($3.3 million) had major renovations

Systematic observation using SOPARC (population-level)

Senior centre: 2,188 users; Skate park: no exact count provided

1 control site per intervention; one skate park and one senior centre

Cohen et al. [40]

US

Repeated cross-sectional

12 parks, ranging from 0.5 to 46 acres, had “Family Fitness” Zones (outdoor gyms) installed (average of $45,000 per park)

1) Systematic observation using SOPARC (population-level)

2) Self-report intercept interviews (individual-level)

1) 9,476 park users

2) 2,636 interviews

10 matched control parks

Fitzhugh et al. [41]

US

Repeated cross-sectional

A 2.9-mile, 8-foot wide urban greenway/trail was retrofıtted in a neighbourhood ($2.1 million)

Systematic observation (population-level)

No exact count provided

2 matched control neighbourhoods

Gustat et al. [42]

US

Repeated cross-sectional

A 6-block walking path and a school playground were installed (cost not reported)

1) Self-report survey (individual-level)

2) Systematic observation using SOPARC/SOPLAY (population-level)

1) 1,191 interviews

2) No exact count provided

2 matched control neighbourhoods

Krizek et al. [43]

US

Repeated cross-sectional

Installation of bicycle lanes and off-street bicycle paths (cost not reported)

Self-report census data (indivudal-level)

No exact count provided

1 buffer zone based on distance from intervention facilities

Merom et al. [44]

Australia

Mixed

Construction of a Rail Trail and a local promotional campaign to raise awareness of the facility (cost not reported)

1) Self-report survey (individual-level)

2) Systematic observation (population-level)

1) 450 households at follow-up

2) No exact count provided

1 outer area located 1.5 to 5 km from the Rail Trail

Parker et al. [45]

US

Repeated cross-sectional

A 1-mile, 5-foot wide bike lane was constructed (cost not reported)

Systematic observation (population-level)

No exact count provided

2 adjacent streets

Tester and Baker [46]

US

Repeated cross-sectional

2 public parks underwent playfield renovations and staff development programs ($5.5 million)

Systematic observation using SOPARC (population-level)

4,889 park visitors

1 matched control park

Veitch et al. [47]

Australia

Repeated cross-sectional

A park (size: 25,200 m2) was refurbished (cost not reported)

Systematic observation using SOPARC (population-level)

2,050 park users

1 matched control park (size: 10,000 m2)

West and Shores [48]

US

Within-person longitudinal

5 miles of greenway added to an existing greenway (cost not reported)

Self-report survey (individual-level)

166 residents

1 buffer zone based on distance from greenway

  1. aSOPARC (System for Observing Play and Recreation in Communities) [49] is a validated instrument for measuring physical activity using systematic observation in community settings; SOPLAY (System for Observing Play and Leisure Activity in Youth) [50] is a validated instrument for measuring physical activity using systematic observation in free play settings (e.g., during lunchtime at school)