Table 2.

Adjusted Predictors of Prescribing Antibiotics for a Presumed Viral Illness

Predictor Variable	Odds Ratio	95% CI for Odds Ratio
Encounter with no observation  between 10/96 and 3/97*	3.60**	1.67–7.76
Encounter with no observation  between 10/97 and 3/98*	2.61**	1.27–5.39
Practice site one	0.57	0.20–1.67
Patient age in years	0.95	0.70–1.30

^*Omitted comparison group=Encounters that were observed during the observational study 10/96–3/97.

^**p <.01