Greenness, trees, allergenic trees and allergic outcomes:
results from sensitivity analyses
Effect estimates were similar when we adjusted the three models with
tree exposure variables additionally for NDVI (Table 3). Similar
associations were observed for the 100 m (Table E3) and 1,000 m (Table
E4) buffers, with some exceptions. In case of the 100 m buffer,
associations between NDVI and asthma, the association between allergenic
trees definition 1 and food sensitization, and the associations of total
number of trees and NDVI with aeroallergen sensitization were not
present. For the 1,000 m buffer, no associations with aeroallergen
sensitization were observed and the association between medium NDVI and
asthma was lost.
Effect estimates from crude and additionally adjusted models were very
similar to those from the main models (Table E5). The same was true when
children with partially missing outcome variables were excluded (data
not shown). The associations between trees and asthma, allergenic trees
definition 2 and asthma, and NDVI and aeroallergen sensitization got
stronger with age. Effect modification by moving between birth and 2
years did not reveal a distinct pattern (Figure E3). Similarly, a mixed
pattern was observed considering effect modification by residing close
to structured green spaces (Figure E4).