Table 2: Likelihood of acute sinusitis as determined by number of signs and symptoms present*
No. of signs/symptoms	No. of patients		Likelihood ratio
	With sinusitis	Without sinusitis
4	16	4	6.4
3	29	18	2.6
2	27	39	1.1
1	14	48	0.5
0	2	32	0.1
Total	88	141
*Data adapted from Williams and Simel [31].

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