Table 2. Frequency of traveler’s diarrhea and crude rates per 100 person-days according to study variables.

		Cases	Person-days	Rate/ 100 d	95%CI 100 d°	Non adjusted rate ratios RR	95%CI	p-value
WC/rBS vaccination	Yes	186	11025	1.69	(1.45–1.94)	0.79	(0.64–0.96)	0.018
	No	199	9286	2.14	(1.86–2.46)	1
	Total	385	20311	1.85	(1.71–2.09)
DEMOGRAPHIC VARIABLES
Sex	Male	151	8518	1.77	(1.51–2.07)	1		0.280
	Female	234	11793	1.98	(1.74–2.25)	0.89	(0.72; 1.09)
Age (years)	< 30	182	6446	2.82	(2.43–3.26)	1		0.000
	30–44	165	10036	1.64	(1.40–1.91)	0.58	(0.47; 0.72)
	≥ 45	38	3829	0.99	(0.71–1.34)	0.35	(0.24; 0.49)
TRAVEL CHARACTERISTICS
Trip duration (weeks)	< 2	90	5426	1.66	(1.34–2.03)	1		0.208
	2–4	214	10390	2.06	(1.79–2.35)	1.24	(0.97; 1.59)
	> 4	81	4495	1.80	(1.44–2.23)	1.08	(0.80; 1.46)
Geographical area	Africa	173	12422	1.39	(1.19–1.61)	1		0.000
	Asia	212	7889	2.69	(2.34–3.07)	1.93	(1.58; 2.36)
Type of travel	Organized	137	8938	1.53	(1.29–1.80)	1		0.003
	Individual	162	7372	2.19	(1.88–2.56)	1.43	(1.14; 1.80)
	Cooperation	86	4001	2.15	(1.73–2.64)	1.40	(1.06; 1.83)
Travel area	Urban	64	2839	2.25	(1.75–2.86)	1		0.010
	Rural	92	6131	1.50	(1.21–1.83)	0.66	(0.48; 0.91)
	Urban and Rural	229	11341	2.01	(1.77–2.29)	0.89	(0.68; 1.18)
Accommodation	Hotel/Ship/ Lodge/others	291	16152	1.80	(1.60–2.01)	1		0.027
	Private house	94	4159	2.26	(1.84–2.75)	1.25	(0.99;1.58)
HEALTH STATUS
Regular diarrhea	No	362	19757	1.83	(1.65–2.02)	1		0.002
	Yes	23	554	4.15	(2.69–6.13)	2.26	(1.49; 3.45)
Diarrhea in previous trips	Yes	79	3628	2.18	(1.73–2.70)	1		0.151
	No	275	15274	1.80	(1.60–2.02)	0.83	(0.65; 1.07)
	Do not recall	31	1409	2.20	(1.52–3.08)	1.01	(0.66; 1.52)