Table 1.

Comparison of results for patients and healthy volunteers

				Tuberculin skin test		Sputum
	Male	Female	Age	Negative	Positive	Smear+	Culture+
Patients	28	10	51·7 (15–87)*	11	27	9	38
Healthy volunteers	5	17	33 (20–53)		22

^*Among the tuberculin-negative patients only 1 patient was older than 70 years.