Table 2. Influence of 2 nonpredictive clinical factors and 1 social factor on antimicrobial agent prescribing, 2002 versus 1999.

Response	Proportion giving desired response (%)*
	Wisconsin (WI)		Minnesota (MN)
	1999	2002	1999	2002	WI % 2002/WI % 1999 (adjusted)†‡	MN % 2002/MN % 1999 (adjusted)†‡
Purulent nasal discharge	34	61	42	54	1.71 (p<0.001)	1.24 (p = 0.054)
Productive cough with purulent sputum	14	36	20	31	2.61 (p<0.001)	1.31
Received antimicrobial agents for similar symptoms in past	57	72	63	70	1.20 (p = 0.015)	1.10

*Desired response: presence of the factor had little or no influence on the decision to prescribe.
†Only significant p values presented; p values for baseline comparisons not presented.
‡Ratios and corresponding p values adjusted for sex, years in practice, practice setting, and clinician type.