Table 2.

Significance of the interaction between area-level SES and greenery measures: results of Wald tests

Greenery measure	Buffer size	Wald chi-square	P value
Mean greenness (mean NDVI)	0.5 km	0.04	0.98
	1 km	1.19	0.55
	2 km	14.28	< 0.001
Geographic size of greenspace (area with NDVI ≥ 0.6)	0.5 km	0.42	0.81
	1 km	0.43	0.81
	2 km	6.02	0.049

Bold figures denote significant interaction

Models adjusted for age, gender, education status, employment status, household income, population density and corrected for suburb-level clustering