Table 2.

Median (25th and 75th percentiles) of measures of attention [Conners’ Kiddie Continuous Performance Test (K-CPT) at 4–5 y and attentional network task (ANT) at 7 y] and exposure [averages of normalized difference vegetation index (NDVI) and vegetation continuous fields (VCF, % tree cover)].

Variables	4–5-y follow-up			7-y follow-up
	Sabadell ($n=364$)	Valencia ($n=524$)	p-Valuea	Sabadell ($n=530$)	Valencia ($n=448$)	p-Valuea
Attentionb
Omissions (counts)	24 (13, 37)	10 (5, 20)	$<0.01$	3 (1, 7)	3 (1, 7)	0.1
Commissions (counts)	22 (15, 30)	22 (15, 29)	0.63	5 (2, 8)	4 (2, 7)	$<0.01$
Hit Reaction Time-Standard Error (ms)	332.8 (252.8, 441.6)	229.7 (171.9, 307.0)	$<0.01$	332.0 (273.8, 381.1)	326.6 (268.6, 385.3)	0.55
Residential surrounding greenness (NDVI)b
$100-\mathrm{m}$ buffer	0.20 (0.16, 0.24)	0.19 (0.17, 0.24)	0.89	0.20 (0.17, 0.25)	0.19 (0.16, 0.24)	0.01
$300-\mathrm{m}$ buffer	0.24 (0.18, 0.29)	0.22 (0.19, 0.27)	0.06	0.24 (0.19, 0.30)	0.22 (0.19, 0.27)	$<0.01$
$500-\mathrm{m}$ buffer	0.26 (0.21, 0.32)	0.24 (0.21, 0.29)	$<0.01$	0.26 (0.21, 0.32)	0.23 (0.20, 0.28)	$<0.01$
Residential surrounding tree cover (VCF)b
$100-\mathrm{m}$ buffer	1.6 (1.2, 2.3)	0.3 (0.1, 0.7)	$<0.01$	1.7 (1.3, 2.4)	0.4 (0.2, 0.8)	$<0.01$
$300-\mathrm{m}$ buffer	1.9 (1.4, 2.7)	0.6 (0.3, 1.0)	$<0.01$	2.0 (1.6, 2.8)	0.7 (0.4, 1.0)	$<0.01$
$500-\mathrm{m}$ buffer	2.2 (1.5, 3.0)	0.7 (0.5, 1.0)	$<0.01$	2.2 (1.7, 3.1)	0.8 (0.6, 1.1)	$<0.01$

^ap-value for Mann–Whitney U test.

^bFor the follow-up at 4 or 5 y, the NDVI was averaged for addresses at birth and 4–5 y and for the follow-up at 7 y, the NDVI was averaged for addresses at birth, 4 or 5 years, and 7-years.