Table 2.

Neighbourhood characteristics in cases and controls^a

	Control group	Case group	t-test P
Neighbourhood fragmentation, mean (s.d.)	0.00 (1.00)	0.08 (0.91)	<0.001
Neighbourhood fragmentation, median (IQR)	0.02 (1.30)	0.06 (1.16)
Neighbourhood crime, mean (s.d.)	0.27 (0.81)	0.41 (0.74)	<0.001
Neighbourhood crime, median (IQR)	0.36 (0.99)	0.47 (0.85)
Neighbourhood income deprivation, mean (s.d.)	0.09 (0.89)	0.29 (0.82)	<0.001
Neighbourhood income deprivation, median (IQR)	0.08 (1.33)	0.33 (1.20)
Neighbourhood population density, mean (s.d.))	0.28 (0.97)	0.41 (0.91)	<0.001
Neighbourhood population density, median (IQR)	0.20 (1.25)	0.34 (1.18)

IQR, interquartile range.

^a.All neighbourhood characteristics were positively scaled, that is, a higher score indicates greater fragmentation, crime, income deprivation and population density, respectively.