Can the detection of IgA anti-Mycoplasma pneumoniae added to IgM increase diagnostic accuracy in patients with infections of the lower respiratory airways?

Table 3 Increase of diagnosis divided per age group adding search of IgA to IgM, compared to cases that can be diagnosed considering IgM alone

	Age (yr)
Antibodies	0-10	11-20	21-30	31-40	41-50	51-60	61-70	71-80	> 80
n	91	30	25	48	55	91	155	289	283
IgM without IgA	17 (18.7%)	5 (16.7%)	2 (8.0%)	6 (12.5%)	2 (3.6%)	4 (4.4%)	5 (3.2%)	4 (1.4%)	8 (2.8%)
95%CI	10.69-26.71	3.35-30.05	0.00-18.63	3.14-21.86	0.00-8.52	0.19-8.61	0.43-5.97	0.05-2.75	0.88-4.72
IgA without IgM	1 (1.1%)	0 (0%)	0 (0%)	1 (2.1%)	0 (0%)	4 (4.4%)	5 (3.2%)	12 (4.1%)	14 (4.9%)
95%CI	0.00-3.24	0.00-0.00	0.00-0.00	0.00-6.16	0.00-0.00	0.19-8.61	0.43-5.97	1.81-6.39	2.38-7.41
IgM plus IgA	5 (5.5%)	3 (10.0%)	1 (4.0%)	1 (2.1%)	0 (0%)	1 (1.1%)	0 (0%)	2 (0.7%)	0 (0%)
95%CI	0.82-10.18	0.00-20.74	0.00-11.68	0.00-6.16	0.00-0.00	0.00-3.24	0.00-0.00	0.00-1.66	0.00-0.00
Increase of diagnosis	1.1%	0%	0%	2.1%	0%	4.4%	3.2%	4.1%	4.9%
95%CI	0.00-3.24	0.00-0.00	0.00-0.00	0.00-6.16	0.00-0.00	0.19-8.61	0.43-5.97	1.81-6.39	2.38-7.41