Table 2.

Residential greenness levels with different buffers among SAGE participants ($n=\mathrm{8,481}$).

NDVI in buffer	$\text{Mean}\pm \text{SD}$	Median, IQR	${\mathrm{P}}_{25}$	${\mathrm{P}}_{75}$	Minimum	Maximum
$100\mathrm{m}$	$0.53\pm 0.21$	0.50, 0.35	0.35	0.71	0.18	0.93
$250\mathrm{m}$	$0.55\pm 0.19$	0.54, 0.36	0.37	0.73	0.22	0.92
$500\mathrm{m}$	$0.57\pm 0.19$	0.60, 0.36	0.38	0.74	0.19	0.93
$\mathrm{1,000}\mathrm{m}$	$0.58\pm 0.19$	0.61, 0.35	0.39	0.74	0.25	0.92
$\mathrm{2,000}\mathrm{m}$	$0.59\pm 0.18$	0.62, 0.33	0.40	0.73	0.23	0.91
$\mathrm{3,000}\mathrm{m}$	$0.60\pm 0.18$	0.63, 0.31	0.42	0.73	0.26	0.91

Note: Residential greenness levels (NDVI) were all NDVI values measured at previous timepoint. IQR, interquartile range; NDVI, normalized difference vegetable index; ${\mathrm{P}}_{25}$, 25th percentile; ${\mathrm{P}}_{75}$, 75th percentile; SAGE, Study on Global Ageing and Adult Health; SD, standard deviation.