Table 2. Classification of 72 patients with primary and secondary MAC by ATS/IDSA diagnostic criteria.

	All patients	Primary	Secondary	P-value
	(n = 72)	(n = 19)	(n = 53)
Met ATS/IDSA criteria	41 (57%)	9 (47%)	32 (60%)
Did not meet ATS/IDSA criteria	31 (43%)	10 (53%)	21 (40%)	0.33
Missing criteria*
Symptoms	3/31 (4%)	1/10 (10%)	2/21 (10%)	0.97
Microbiology	17/31 (55%)	5/10 (50%)	12/21 (57%)	0.71
Radiology	14/31 (45%)	5/10 (50%)	9/21 (43%)	0.71

^*categories not mutually exclusive.