Table 3. Multiple linear regression to assess the association between study variables and duration of diarrhea .

Variables	Crude model			Adjusted model*			Backward model
	β	95% CI for β	P value	β	95% CI for β	P value	β	95% CI for β	P value
Age	-0.02	-0.4- -0.007	<0.001	-0.02	-0.03- -0.003	<0.001	-0.02	-0.03- -0.004	<0.001
Gender	-0.37	-1.2- -0.52	0.413
Frequency of diarrhea	-0.05	-0.56- 0.46	0.842
Dehydration	0.04	-0.88- 0.97	0.924
Study Group**	-0.05	-0.56- -0.46	0.001	-1.28	-2.11- -0.46	0.003	-1.34	-2.17- -0.51	0.002
Sodium at baseline	-0.05	-0.14- 0.03	0.202
Potassium at baseline	-1.23	-2.46- 0.002	0.051	-0.80	-1.98- 0.37	0.178
Calcium at baseline	-0.21	-0.66- 0.23	0.347

*All variables with p<0.2 were enrolled in the model.

*Study group: (1=Placebo, 2=Intervention)