TABLE 2.

Incidence rate and incidence relative risk of ETEC phenotype by selected features, Abu Homos, Egypt, 2004 to 2007

Feature	ETEC toxin phenotype
	LT only			ST only			LT/ST
	IR (no. of episodes)c	Crude IRR	Adjusted IRRd	IR (no. of episodes)	Crude IRR	Adjusted IRR	IR (no. of episodes)	Crude IRR	Adjusted IRR
Child age (mo)
0–5	0.46 (58)	1.00	1.00	0.51 (65)	1.00	1.00	0.20 (25)	1.0	1.0
6–11	0.72 (93)	1.53 (1.11, 2.13)e	1.48 (1.02, 2.15)e	0.84 (109)	1.61 (1.18, 2.18)f	1.37 (0.98, 1.90)	0.28 (36)	1.38 (0.83, 2.29)	1.09 (0.64, 1.85)
12–17	0.77 (99)	1.64 (1.18, 2.26)f	1.57 (1.08, 2.29)e	0.50 (64)	0.94 (0.67, 1.33)	0.82 (0.56, 1.18)	0.31 (40)	1.53 (0.93, 2.53)	1.17 (0.69, 1.98)
18–23	0.66 (84)	1.38 (0.99, 1.93)	1.24 (0.81, 1.91)	0.42 (53)	0.78 (0.54, 1.12)	0.65 (0.41, 1.01)	0.24 (30)	1.15 (0.67, 1.95)	0.74 (0.40, 1.39)
Child's gender
Male	0.70 (175)	1.14 (0.92, 1.42)	1.16 (0.93, 1.44)	0.60 (152)	1.14 (0.90, 1.43)	1.12 (0.89, 1.41)	0.33 (84)	1.87 (1.30, 2.65)g	1.81 (1.26, 2.60)f
Female	0.61 (159)	1.0	1.0	0.54 (139)	1.0	1.0	0.18 (47)	1.0	1.0
Breast-feeding
Exclusively	0.42 (19)	0.59 (0.36, 0.96)e	0.76 (0.41, 1.40)	0.31 (14)	0.62 (0.35, 1.11)	0.47 (0.24, 0.91)e	0.07 (3)	0.23 (0.07, 0.74)e	0.19 (0.05, 0.67)e
Not exclusively	0.66 (221)	0.93 (0.73, 1.18)	0.86 (0.64, 1.15)	0.63 (212)	128 (0.97, 1.70)	0.89 (0.64, 1.26)	0.27 (90)	0.93 (0.64, 1.36)	0.66 (0.42, 1.04)
Not breast-fed	0.72 (94)	1.0	1.0	0.50 (65)	1.0	1.0	0.29 (38)	1.0	1.0
Season at follow-upa
Warm	0.83 (225)	1.87 (1.49, 2.36)g	1.89 (1.50, 2.38)g	0.88 (237)	3.98 (2.96, 5.35)g	3.91 (2.91, 5.25)g	0.42 (114)	6.09 (3.66, 10.13)g	6.04 (3.63, 10.06)g
Cold	0.45 (109)	1.0	1.0	0.22 (54)	1.0	1.0	0.07 (17)	1.0	1.0
Maternal education
Some schooling	0.59 (126)	0.84 (0.68, 1.05)	0.83 (0.66, 1.04)	0.52 (111)	0.85 (0.68, 1.09)	0.87 (0.68, 1.11)	0.21 (44)	0.70 (0.49, 1.01)	0.75 (0.52, 1.10)
No schooling	0.70 (208)	1.0	1.0	0.60 (180)	1.0	1.0	0.29 (87)	1.0	1.0
Garbage container in house
Yes	0.61 (57)	0.92 (0.70, 1.23)	0.99 (0.74, 1.34)	0.45 (42)	0.76 (0.55, 1.05)	0.80 (0.57, 1.12)	0.21 (20)	0.81 (0.50, 1.30)	1.03 (0.63, 1.68)
No	0.66 (277)	1.0	1.0	0.60 (249)	1.0	1.0	0.27 (111)	1.0	1.0
Sanitary latrine
Yes	0.67 (275)	1.14 (0.87, 1.52)	1.15 (0.87, 1.53)	0.59 (243)	1.25 (0.92, 1.70)	1.23 (0.90, 1.68)	0.27 (111)	1.37 (0.85, 2.20)	1.36 (0.84, 2.20)
No	0.58 (59)	1.0	1.0	0.48 (48)	1.0	1.0	0.20 (20)	1.0	1.0
Crowdingb
≥4.75	0.65 (55)	1.10 (0.80, 1.50)	1.10 (0.80, 1.51)	0.60 (51)	1.12 (0.81, 1.55)	1.07 (0.77, 1.49)	0.22 (19)	1.12 (0.66, 1.91)	1.06 (0.61, 1.82)
≥3.5 to <4.75	0.72 (137)	1.21 (0.96, 1.54)	1.21 (0.95, 1.54)	0.59 (111)	1.08 (0.84, 1.40)	1.04 (0.80, 1.35)	0.34 (64)	1.68 (1.15, 2.44)f	1.50 (1.02, 2.22)e
<3.5	0.60 (142)	1.0	1.0	0.54 (129)	1.0	1.0	0.20 (48)	1.0	1.0
Socioeconomic status
Poor	0.57 (69)	0.85 (0.65, 1.10)	0.79 (0.60, 1.03)	0.57 (69)	1.01 (0.77, 1.32)	0.95 (0.72, 1.26)	0.33 (40)	1.43 (0.98, 2.07)	1.24 (0.84, 1.83)
Nonpoor	0.68 (265)	1.0	1.0	0.57 (222)	1.0	1.0	0.23 (91)	1.0	1.0

^aWarm season from May to October; cold season from November to April.

^bNumber of person per bedroom.

^cEpisodes per child-years of follow-up.

^dAdjusted for statistically significant univariate predictors, including child's age, child's gender, season of follow-up, and crowding, using multivariate Poisson regression.

^eP < 0.05.

^fP < 0.01.

^gP < 0.001.