. 2013 Jun 17;67(9):751–757. doi: 10.1136/jech-2012-202080

Table 4.

Effects of the intervention on health centre utilisation across income groups, according to place of residence and severity of illness (source: panel survey)

Severity	Place of residence	Income group		Ratio (1)/(2) Est. and (95%CI)
Severity	Place of residence	First income quartile (1) Rate ratio* and (95% CI)	Other income groups (2) Rate ratio* and (95%CI)	Ratio (1)/(2) Est. and (95%CI)
Severe	d<5 km	5.23 (1.30 to 20.99)	2.23 (1.29 to 3.86)	2.35 (0.44 to 12.45)
Severe	d≥5 km	1.28 (0.90 to 1.82)	1.56 (0.87 to 2.79)	0.82 (0.40 to 1.66)
Not severe	d<5 km	0.87 (0.39 to 1.95)	1.90 (1.23 to 2.92)	0.46 (0.20 to 1.04)
Not severe	d≥5 km	1.15 (0.54 to 2.47)	1.65 (1.20 to 2.27)	0.70 (0.34 to 1.42)

*Rate ratios estimated by multilevel Poisson regression.