Inflammatory bowel disease in an underdeveloped region of Northeastern Brazil

Table 1 Demographic characteristics of the population of the state of Piauí (Brazil) in 2010 and of patients with inflammatory bowel disease (total), Crohn’s disease, and ulcerative colitis according to gender, race, education, family income, and residence (urban or rural) in Piauí (Brazil), 1988-2012

Demographic variables		General population of Piauí1: (n= 3118360)	IBD phenotype
			CD (n= 100)	UC (n= 152)	Overall IBD (n= 252)
			n(%)	n(%)	n(%)
Gender	Male	49.0%	54 (54.0)	55 (36.2)	109 (43.3)
	Female	51.0%	46 (46.0)	97 (63.8)	143 (56.7)
	χ2 test	-	P = 0.32	P = 0.00	P = 0.07
Race	Miscegenated	64.0%	64 (64.0)	107 (70.4)	171 (67.9)
	White	24.4%	26 (26.0)	34 (22.4)	60 (23.8)
	Black	9.4%	10 (10.0)	10 (6.6)	20 (7.9)
	Yellow	2.2%	0 (0)	1 (0.6)	1 (0.4)
	χ2 test	-	P = 0.50	P = 0.24	P = 0.18
Education (yr of schooling)	Uneducated and < 9 yr	58.2%2	25 (25.0)	70 (46.0)	95 (37.8)
	≥ 9 yr	41.8%	75 (75.0)	82 (53.9)	157 (62.4)
	χ2 test	-	P = 0.00	P = 0.00	P = 0.00
Residence	Urban area	65.8%	93 (93.0)	124 (81.6)	217 (86.1)
	Rural area	34.2%	7 (7.0)	28 (18.4)	35 (13.9)
	χ2 test	-	P = 0.00	P = 0.00	P = 0.00
Average income	Monthly3	247.00 USD	643.50 USD	555.40 USD	590.40 USD

¹Source: Brazilian Institute of Geography and Statistics (Instituto Brasileiro de Geografia e Estatística - IBGE [database online], 2010);

²Individuals aged > 18 yr;

³State of Piauí = income per capita, study population: family income. IBD: Inflammatory bowel disease; CD: Crohn’s disease; UC: Ulcerative colitis.