Table 2. Hierarchical final models of diarrhea in children under five years of age. State of Pernambuco, Brazil, 1997 and 2006.

Variable			1997				2006
			Sample	Diarrhea	PR (95%CI)a	p	Sample	Diarrhea	PR (95%CI)a	p
			N	n (%)			N	n (%)
Distal level
Group A
	Geographical area
		Metropolitan region	734	124 (16.9)	1.0	0.043	427	45 (10.5)	1.0	< 0.001
		Urban interior	685	154 (22.5)	1.33 (1.06–1.66)		416	81 (19.5)	1.87 (1.31–2.66)
		Rural interior	651	131 (20.1)	1.22 (0.97–1.53)		789	169 (21.4)	2.07 (1.50–2.85)
Intermediate level
Group B
	Waste destination
		Public waste collection	1,046	177 (16.9)	1.0	< 0.001b	-	-	-	-
		Others	1,024	232 (22.7)	1.50 (1.19–1.88)		-	-	-	-
	No. of people per room
		< 1	429	63 (14.7)	1.0	0.026b	653	113 (17.3)	1.0
		1–2	1,014	200 (19.7)	1.29 (0.98–1.68)		780	132 (16.9)	0.86 (0.68–1.09)	0.028
		≥ 2	627	146 (23.3)	1.47 (1.11–1.95)		199	50 (25.1)	1.29 (0.94–1.75)
	Water supply
		General network	-	-	-	-	918	148 (16.1)	1.0	0.028
		Others	-	-	-	-	714	147 (20.6)	0.67 (0.47–0.96)
	Drinkable water treatment
		Boiled/Filtered/Chlorinated Mineral	-	-	-	-	823	104 (12.6)	1.0	< 0.001
		Strained/Untreated/Other	-	-	-	-	809	191 (23.6)	1.77 (1.35–2.32)
Distal level
Group C
	Refrigerator possession
		Yes	1,138	178 (15.6)	1.0	0.001c	-	-	-	-
		No	932	231 (24.8)	1.45 (1.16–1.80)		-	-	-	-
	Per capita income
		< 0.50	-	-	-	-	1,366	267 (19.5)	1.67 (1.06–2.61)	0.026
		≥ 0.50	-	-	-	-	233	21 (9.0)	1.0
Group D
	Maternal age (years)
		10–19	169	47 (27.8)	1.48 (1.05–2.08)	0.037d	98	24 (24.5)	1.70 (1.08–2.66)	0.014d
		20–24	561	129 (23.0)	1.23 (0.94–1.60)		344	78 (22.7)	1.64 (1.16–2.32)
		25–34	919	158 (17.2)	1.01 (0.78–1.30)		780	131 (16.8)	1.20 (0.89–1.62)
		≥ 35	403	72 (17.9)	1.0		365	53 (14.5)	1.0
	Maternal education (years)
		< 4	861	205 (23.8)	1.65 (1.21–2.27)	0.006e	-	-	-	-
		4–7	644	138 (21.4)	1.55 (1.15–2.09)		-	-	-	-
		≥ 8	547	63 (11.5)	1.0		-	-	-	-
Proximal level
Group E
	Child's age (months)
		0–11	454	113 (24.9)	1.57 (1.27–1.94)		296	49 (16.6)	1.04 (0.76–1.41)
		12–23	410	112 (27.3)	1.73 (1.41–2.12)	< 0.001f	347	97 (28.0)	1.77 (1.41–2.23)	< 0.001f
		24–59	1,188	181 (15.2)	1.0		953	142 (14.9)	1.0

^aRazões de prevalências ajustadas.

^bAjustados para a variável do nível A.

^cAjustado para as variáveis dos níveis A e B.

^dAjustados para as variáveis dos níveis A, B e C.

^eAjustado para as variáveis dos níveis A, B, C e D.

^fAjustado para as variáveis dos níveis A, B, C, D e E.