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Neighbourhood safety and area deprivation modify the associations between parkland and psychological distress in Sydney, Australia
© Chong et al.; licensee BioMed Central Ltd. 2013
Received: 30 July 2012
Accepted: 9 April 2013
Published: 1 May 2013
The aim of this study was to investigate how perceived neighbourhood safety and area deprivation influenced the relationship between parklands and mental health.
Information about psychological distress, perceptions of safety, demographic and socio-economic background at the individual level was extracted from New South Wales Population Health Survey. The proportion of a postcode that was parkland was used as a proxy measure for access to parklands and was calculated for each individual. Generalized Estimating Equations logistic regression analyses were performed to account for correlation between participants within postcodes, and with controls for socio-demographic characteristics and socio-economic status at the area level.
In areas where the residents reported perceiving their neighbourhood to be “safe” and controlling for area levels of socio-economic deprivation, there were no statistically significant associations between the proportion of parkland and high or very high psychological distress. In the most disadvantaged neighbourhoods which were perceived as unsafe by residents, those with greater proportions of parkland, over 20%, there was greater psychological distress, this association was statistically significant (20-40% parkland: OR=2.27, 95% CI=1.45-3.55; >40% parkland: OR=2.53, 95% CI=1.53-4.19).
Our study indicates that perceptions of neighbourhood safety and area deprivation were statistically significant effect modifiers of the association between parkland and psychological distress.
Greenspace is defined as any vegetated land adjoining an urban area  and includes bushland, nature reserves, national parks, outdoor sports fields, school playgrounds and rural or semi-rural areas immediately adjoining an urban area. It can impact on physical and mental health through a number of pathways: it has a restorative function [2, 3], provide opportunities for physical activity [4, 5] and facilitate social connections [6, 7]. Further, greenspaces and attractive surroundings can increase physical activity with its associated effects on physical and mental health. People who have better access to parks and greenspaces are more likely to report that they engage in physical activity [8–12] and attractive parks are associated with higher levels of walking . However, there are also studies that report no associations between greenspace and physical activity [14, 15] and hence the evidence for the impact of greenspace on physical activity is not as clear.
Parklands and greenspaces can also impact on well-being and mental health. Maas et al.  reported an association between the higher percentage of greenspace within a one or three kilometre radius and better self-rated health. De Vries et al.  also found positive associations between greenspace and self-rated health and that the effect was stronger in women who worked in the home and the elderly - the two groups of people who would be likely to spend more time in the local area. Grahn and Stigsdotter  reported associations between increased urban park use and lower levels of reported stress. In Australia, respondents who perceived their neighbourhood to be very green also reported better physical and mental health . Further, greenspace can facilitate increased social connectedness [20–22] which in turn is associated with better health and well-being . Here again the evidence for the beneficial effect of parkland on mental health and well-being is far from clear. For example, a study in England found no association between greenspace and self-rated health in higher income suburban and higher income rural areas and that greater amount of greenspace was associated with poorer health in low-income suburban areas . Further, although van Dillen et al. showed a positive association between the quantity of greenspace and mental health, they were unable to demonstrate an association between the quality of greenspace and mental health.
Recent evidence suggests that neighbourhood physical and social characteristics, for example, vandalism, litter, safety, gangs and vacant housing are associated with psychological distress . Even perceptions of violence, crime, drug use and graffiti are associated with mental health problems such as depression and anxiety . Social factors such as neighbourhood deprivation, social isolation and social mobility are all associated with depression [28–31].
An important factor that may modify the effects of greenspace or parkland on physical activity and mental health is physical characteristics of the neighbourhood and the perception of how safe one feels in a neighbourhood. The perception that the neighbourhood is unsafe can lead people choosing not to use parks and greenspaces [32, 33]. Furthermore, area deprivation may also mediate the effects of parkland on physical activity and well-being. The provision of parkland has been found to be poorer in lower socioeconomic status areas in one study . The quality of parkland and greenspaces facilities and safety were poorer in more deprived areas [34, 35] and residents living in deprived areas reported higher perceptions of problems with safety, more negative perceptions of their neighbourhood and were less likely to use the greenspaces [36, 37]. Hence, perceptions of neighbourhood safety and area deprivation may be important factors in mediating the effects of parkland on mental health and well-being. No studies, as far as we aware, have investigated interactions between perceptions of neighbourhood safety, area deprivation and parkland, to explore how perceived neighbourhood safety and area deprivation change the relationship between parklands and mental health. Information from such studies could add to our understanding of the potential complex relationships between parklands and mental health and inform interventions to improve the overall health and well-being of residents. We therefore investigated associations between access to parkland and psychological distress in Sydney, Australia, and whether these associations were modified by perceptions of neighbourhood safety and area deprivation.
The study area was limited to the Sydney Statistical Division and consists of 43 local government areas (LGAs) and 255 postcodes. The study area has a population of approximately 4.12 million people and covers an area of 12,428 square kilometres. The study was conducted in 2011.
Access to parkland
We used the proportion of a postcode that was parkland as a proxy measure for access to parklands. We downloaded the 2006 land use dataset at the mesh block level from the Australian Bureau of Statistics website (http://www.abs.gov.au/AUSSTATS/abs@.nsf/DetailsPage/1209.0.55.0022006?OpenDocument). The mesh block is the smallest geographical unit, their boundaries cover the whole of Australia without gaps or overlaps and can be aggregated reasonably accurately to different geographical and administrative boundaries. We selected all mesh blocks in the study area that were identified as parkland. We allocated parkland mesh blocks to postcodes and calculated the proportion of the postcode that was parkland. Postcodes were then categorised into three groups: 0-19% parkland, 20-40% parkland and >40% parkland. These three categories were used in all analyses.
Psychological distress and perception of neighbourhood safety
We obtained de-identified information about psychological distress, perceptions of safety and relevant covariates at the individual level from the 2007, 2008 and 2009 New South Wales (NSW) Population Health Surveys, NSW Ministry of Health. The NSW Population Health Survey is an on-going telephone survey of residents (from birth upwards conducted continuously between February and December each year). The target population for the surveys was all NSW residents living in households with private telephones and the target sample size was approximately 12,000 people per year. Households were contacted using list assisted random digit dialling. One person from the household was randomly selected for inclusion in the survey. Respondents were asked questions from modules on demographics, health behaviours, health status, and access to and satisfaction with health services.
There were 13,178 adult respondents in the 2007 NSW Population Health Survey, 10,296 adult respondents in the 2008 NSW Population Health Survey and 10,719 adult respondents in the 2009 NSW Population Health Survey, a total of 34,193 respondents aged 16 years or older. Of these respondents, 13,970 (41%) (5,443 from the 2007 survey, 4,241 from the 2008 survey and 4,286 from the 2009 survey) resided in metropolitan Sydney. Of the 13,970 respondents, 10,710 (77%) respondents had information on psychological distress.
Psychological distress was measured using the Kessler-10 (K10) instrument which is a 10-item questionnaire that measures the level of psychological distress in the most recent four week period . A K10 score of ≥22 reflects high or very high psychological distress. Psychological distress was classified as high/very high and none/low/moderate. Perceptions of neighbourhood safety was derived from the following question: “My area has a reputation for being a safe place. Do you agree or disagree?” The responses were classified as strongly agree/agree and disagree/strongly disagree.
Measurement of socio-economic status at the area level
The 2006 Index of Relative Socio-Economic Disadvantage (IRSED) at the postcode level was used in the analyses as a measure of area deprivation. The IRSED was created by the Australian Bureau of Statistics to compare social and economic disadvantage across geographical areas in Australia. The index is derived from the 2006 Census variables such as low income and educational attainment, high unemployment, and people working in unskilled occupations. The index has a mean score of 1,000 and standard deviation of 100 . IRSED was categorised into tertiles for our analyses: tertile 1 (most disadvantaged group), tertile 2 (middle disadvantaged group) and tertile 3 (least disadvantaged group).
We used generalised estimating equations (GEE) logistic regression models to examine the association between parkland and high/very high psychological distress. GEE logistic regression accounted for correlation between participants within postcodes. As we had a large sample size, only statistically significant variables from the univariate regression analyses were included in the final model to account for any potential confounding effect. These variables were age, gender, household income, highest level of education completed, employment status, self-rated health and population density. Population density was included in the model as it can be associated with anxiety and depression in older people .
Both one-way and two-way interactions between safety, area deprivation index and parkland were explored. One-way interactions between perceived safety and area deprivation index, neighbourhood safety and parkland, and area deprivation index and parkland were all statistically significant (p<0.0001 for all three one-way interactions). The two-way interaction between safety, area deprivation index and parkland was also statistically significant (p<0.0001). The size of our dataset (n=10,710) provided sufficient statistical power to stratify the data rather using two-way interaction terms, which can be difficult to interpret. We therefore developed regression models, stratifying the data by reported neighbourhood safety.
The main effect of parkland on high/very high psychological distress generated from the GEE logistic regression model is presented in the Result section, followed by the GEE logistic regression model with interaction effects between area deprivation index and parkland.
Results from GEE models are presented as odds ratios (ORs) together with their 95 percent confidence intervals (95%CI). All estimates were weighted to adjust for differences in the probabilities of selection among subjects and for differences between the age and sex structure of the sample and Australian Bureau of Statistics mid-year population estimates for NSW. All analyses were conducted using Proc Genmod in SAS v9.2 (SAS Institute Inc., Cary, NC).
De-identified health survey data were provided to us by the NSW Ministry of Health who are the data custodians. The NSW Ministry of Health approved the use of the health survey data for this study. Ethics approval from an institutional human research ethics committee was not required.
The study area comprised 260 postcodes. The mean population of postcodes was 15,929 persons (standard deviation=12,839 persons), median was 13,147 persons and the range was 80–85,333 persons. The mean geographic area of postcodes was 56 km2, the median was 7.6 km2 and the range was 0.6-3,527 km2. The mean population density per postcode was 2,289 persons per square kilometre (standard deviation=1,824, median=1,938, range=1-11,442). There was a mean of 55 respondents per postcode (range=1-248).
High or very high psychological distress by demographic characteristics (weighted to the population)
High/very high psychological distress1
OR. 95% CI
Age group (years)
Did not complete high school
Employment status 3
Index of Relative Socio-Economic Disadvantage
Most disadvantaged group
Middle disadvantaged group
Least disadvantaged group
Perceived neighbourhood safety
Excellent, very good or good
Fair, poor or very poor
There were statistically significant associations between parkland and area deprivation (p<0.0001), between parkland and whether respondents thought their local area had a reputation for being a safe place (p=<0.0001) and area deprivation and perceptions of safety (p<0.0001).
Associations between proportion of postcode that is parkland and high or very high psychological distress *
Perception of neighbourhood safety
Area disadvantage (tertiles of IRSED)
Not a safe neighbourhood
Most disadvantaged group
2.27 (1.45−3.55) <0.01
2.53 (1.53−4.19) <0.01
Middle disadvantaged group
0.38 (0.15−0.92) 0.03
1.92 (0.95−3.88) 0.07
Least disadvantaged group
2.15 (0.32−14.31) 0.43
2.92 (0.55−15.53) 0.21
Most disadvantaged group
1.02 (0.59−1.74) 0.96
1.21 (0.56−2.58) 0.63
Middle disadvantaged group
0.81 (0.42−1.56) 0.53
0.68 (0.34−1.36) 0.28
Least disadvantaged group
0.79 (0.39−1.59) 0.51
1.20 (0.55−2.59) 0.65
There were no statistically significant associations between proportion of parkland and psychological distress in respondents who perceived that their neighbourhood was a safe place (Table 2). However, respondents in the middle group for area deprivation who perceived that their neighbourhood was not a safe place had non-statistically significant lower risks of high/very high psychological distress compared to residents in the most and least deprived postcodes.
In this study, there were no associations between the proportion of parkland and psychological distress where it was perceived that the neighbourhood was safe. However, there were significant statistically significant associations between the proportion of parkland and high or very high psychological distress when the proportion of parkland was ≥20% and if it was perceived that the neighbourhood was unsafe. As with many other studies, we controlled for important potential confounders such as age, gender, income, level of education and population density which, in our data, were associated with high or very high psychological distress. In addition, we also investigated interactions between proportion of parkland and perceptions of neighbourhood safety and area deprivation.
Although many studies have suggested that exposure to greenspace or parkland is associated with better health and well-being [16, 17, 19], we were not able to demonstrate that exposure to a higher proportion of parkland was associated with less psychological distress. However, we did find evidence indicating that perceptions of neighbourhood safety and area deprivation were statistically significant effect modifiers of the association between parkland and psychological distress.
No studies, as far as we are aware, have reported on effect modification of the association between parkland and mental health by area deprivation. Our findings show that increased psychological distress is associated with high proportion of parkland in both the most and the least socio-economically disadvantaged areas but only if the neighbourhood is perceived as unsafe. If the neighbourhood was perceived as safe, then there were only weak non-statistically significant associations between parkland and psychological distress regardless of area deprivation. In the United Kingdom, Mitchell and Popham  reported poorer self-rated health with increasing percentage of greenspace in suburban low income areas but not in urban and rural low income areas and suggest that this may be due to a larger proportion of poorer quality greenspace in low income suburban areas. Residents of deprived neighbourhoods also have poorer perceptions of access to greenspace (despite shorter mean distances to greenspace compared to less deprived neighbourhoods) [36, 41] and safety of greenspace . More disadvantaged areas are also more likely to have poorer lighting (Crawford et al.) which may influence safety from crime .
The importance of neighbourhood safety is also reflected in several papers where it is proposed that safe environments stimulate positive behaviours (e.g. amount of physical activity) and leads to reduction in stress [33, 42, 43]. Also, Agyemang et al. suggested feeling unsafe and dissatisfaction with greenspace was associated with poor self-rated health and discourages people engaging in outdoor activities . Parkland associated with poor neighbourhood safety is consistently negatively associated with physical activity [41, 45–47]. Jones et al.  reported statistically significant decreasing trends in levels of adequate physical activity with increasing perceptions of lack of safety of greenspace. Parklands may be a space for criminal activities and antisocial behaviours, and would explain why people may feel unsafe in neighbourhoods with large proportions of parkland . This in turn may impact on recreational physical activity levels which in turn may adversely impact on psychological health and well-being.
In our study, respondents of the middle disadvantaged group, compared to the most disadvantaged and least disadvantaged areas, were less likely to report increased psychological distress with increasing percentages of parkland regardless of perceptions of the safety of the neighbourhood. It is not clear to us why this is so. This may be due to anomalies in the spatial level of our parkland data or to some important unmeasured confounders. However, it is not unusual to observe similar non-linear relationships in the literature. For example, a non-linear relationship between socio-economic status and psychological distress has been previously reported  and Poulos at al.  found a non-linear relationship between socio-economic status and childhood injuries.
The strengths of our study were that our subjects were part of an ongoing population based health status and risk behaviour survey, we had a large sample size and we took into account the multi-level nature of the data. The relatively high response rates (63.6% in 2007, 63.4% in 2008 and 58.7% in 2009) and the representativeness of the NSW Population Health Survey weighted sample ensures that our results are generalisable to metropolitan Sydney and other similar major Australian cities .
There are a number of limitations to our study. We obtained information on parkland from the ABS as land use data at the mesh block level. However, the electronic data did not allow us to analyse the data by number of discrete parks as a number of parcels of parkland could have contributed to a defined park. Further, parkland included state forests and national parks. We could not categorise parkland into more usable categories, for example, sports fields, bushland, presence of picnic facilities, etc., nor could we assess the quality of the parkland. We were also not able to calculate alternate metrics for access to parklands such as travel distance or travel time to parks as we did not have access to addresses for respondents in the NSW Health Surveys (addresses are not collected as part of the surveys). We were only able to obtain health survey data at the postcode level and hence we were restricted to using postcode as the unit of analysis. We would have preferred individual level data or data at smaller spatial units for analyses so as to have more accurate measures of exposure to parkland and to minimise exposure misclassification which is likely to be non-differential. This limitation of our study may decrease the precision of the estimates but not bias the results. Further, although the NSW Health Surveys were designed to provide estimates for spatial units larger than those used in this study, we do not expect this will affect our findings. Other limitations were that by using data from an existing cross-sectional survey we are not able to make a causal link between parkland and the reported health outcomes and that although we adjusted for a number of important potential confounders, there may yet be some residual confounding. However, we share this limitation with most other published studies on neighbourhoods and health.
Our results highlight the importance of perceptions of neighbourhood safety and psychological distress and the findings should be noted by both government and planners. Further research should explore associations between park characteristics, different metrics for measuring access to parks (for example, distance to parks from residential address, work address and park), and their interaction with socio-demographic factors and neighbourhood environments. Such studies will require collaboration among a range of disciplines such as epidemiology, public health, psychology, urban planning, landscape design and transportation planning, to develop policies and recommendations beneficial to the overall health and well-being of residents.
We wish to acknowledge and thank the New South Wales Health Survey Program, Centre for Epidemiology and Research for collecting the data and the Chief Health Officer for approving, the use of the data.
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