Risks and Benefits of Green Spaces for Children: A Cross-Sectional Study of Associations with Sedentary Behavior, Obesity, Asthma, and Allergy

http://dx.doi.org/10.1289/ehp.1308038



Table 1. Prevalence of outcomes and description of covariates among the study participants, Sabadell, 2006 (n = 3,178).
Variable n (%) or median (IQR)a
aFor continuous variables, median (IQR) and for categorical variables count (percentage) of each category has been reported. bDefined as spending > 1 hr during each working day and > 2 hr during each weekend day on watching television, playing video games, and/or working with computer.
Outcomes  
Current asthma 138 (4.4%)
Current allergic rhinoconjunctivitis 582 (18.6%)
Excessive screen timeb 893 (28.4%)
Obese/overweight 628 (23.0%)
Exposures  
Surrounding greenness (NDVI average)  
100-m buffer 0.038 (0.076)
250-m buffer 0.061 (0.105)
500-m buffer 0.095 (0.120)
1,000-m buffer 0.125 (0.097)
Living within 300 m of a park  
Yes 1,399 (44.0%)
No 1,779 (56.0%)
Living within 300 m of a forest  
Yes 342 (10.8%)
No 2,836 (89.2%)
Covariates  
Age (years) 10.9 (1.6)
Missing (n) 24
Sex  
Female 1,679 (53.0%)
Male 1,491 (47.0%)
Missing (n) 8
Siblings (any)  
Yes 2,690 (85.3%)
No 462 (14.7%)
Missing (n) 26
Sport activity  
≥ 6 hr/week 233 (7.3%)
< 6 hr/week 2,945 (92.7%)
School type  
Private 1,332 (41.9%)
Public 1,846 (58.1%)
Parental educational achievement  
None or primary (≤ 6 schooling years) 623 (20.7%)
Secondary (between 6 and 12 schooling years) 1,380 (45.8%)
University (more than 12 schooling years) 1,012 (33.6%)
Missing (n) 163
Parental asthma  
None 2,739 (88.0%)
Either 353 (11.4%)
Both 19 (0.6%)
Missing (n) 67
Environmental tobacco smoke at home  
No 1,963 (62.1%)
Yes 1,200 (37.9%)
Missing (n) 15