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Table 3 Relationship between NDVI buffer distances and asthma across different time windows

From: Residential greenness, asthma, and lung function among children at high risk of allergic sensitization: a prospective cohort study

Time Window

NDVI Buffer

Distance

Mean NDVI

Adjusted

Model Results1

Non-Asthmatics

Asthmatics

P-value2

Odds Ratio (95% CI)3

Birth

200 m

0.52

0.49

0.04

0.99 (0.8, 1.2)

400 m

0.53

0.51

0.07

0.99 (0.8, 1.3)

800 m

0.54

0.51

0.01

0.84 (0.6, 1.1)

Age 7

200 m

0.56

0.54

0.09

0.94 (0.7, 1.2)

400 m

0.58

0.57

0.23

1.01 (0.8, 1.3)

800 m

0.58

0.57

0.21

1.01 (0.8, 1.4)

Across Childhood

200 m

0.53

0.51

0.01

0.97 (0.7, 1.3)

400 m

0.55

0.54

0.16

1.13 (0.8, 1.6)

800 m

0.56

0.54

0.08

1.04 (0.7, 1.5)

  1. Abbreviations: ECAT Elemental Carbon Attributable to Traffic, m Meter, NDVI Normalized Difference Vegetation Index, CI Confidence Interval
  2. 1Logistic regression models represent the main effects adjusted for ECAT, household income, and community deprivation index
  3. 2P-value for t-test for difference of means
  4. 3Odds ratio per 0.1-unit change in NDVI