Table 2.

Regression of Claritin efficacy on self-reported beliefs about efficacy by allergy status

	Efficacy at 60 min	Efficacy at 120 min
Subjects without allergies
Constant (SE)	11.24 (2.23)	25.86 (1.95)
Change in belief (SE)	2.10 (1.63)	3.76 (1.43)
Observations	150	150
R2	0.19	0.61
Subjects with allergies
Constant (SE)	14.05 (1.82)	27.00 (1.95)
Change in belief (SE)	1.41 (1.40)	3.86 (1.50)
Observations	161	162
R2	0.31	0.59

The table reports coefficients from an ordinary least squares regression. Twenty nonallergic subjects and eight allergic subjects said they did not have beliefs about Claritin at baseline; they are coded as missing observations. There also is one missing measurement of wheal reaction at 60 min, accounting for the difference in the number of observations at 60 and 120 min among subjects with allergies.