TABLE 2.

Factors associated with emm gene type of GAS isolates

Variable	Total no. of isolates	% of isolates of type:
		emm1 (n = 33)	emm2 (n = 50)	emm29 (n = 123)	emm3 (n = 104)	emm44/61 (n = 62)	emm6 (n = 92)	emm75 (n = 44)	Othera (n = 175)	Univariate χ2P valueb
Gender
Male	587	4.94	8.01	18.6	16.2	8.86	13.8	6.47	23.17	0.018
Female	96	4.17	3.13	14.6	9.38	10.4	11.5	6.25	40.63
Age (yrs)
17-18	196	1.02	8.16	20.9	20.4	5.61	10.2	5.61	28.06	0.002
19-20	278	4.68	6.83	17.99	16.19	8.99	15.83	7.91	21.58
21-22	98	4.08	6.12	18.37	11.22	13.3	13.27	6.12	27.55
≥23	107	11.2	8.41	12.2	7.48	12.2	14.02	4.67	29.91
Season
Summer (June-August)	73	4.11	2.74	27.4	6.85	2.74	8.22	6.85	41.10	<0.001
Fall (September-November)	250	3.6	12.4	25.6	23.6	5.20	2.80	0.80	26.00
Winter (December-February)	159	6.92	3.77	16.4	10.1	13.8	21.4	9.43	18.24
Spring (March-May)	204	5.88	5.39	6.37	11.8	12.3	22.1	10.8	25.49
Training site
Navy, Ill.	222	2.70	8.56	0.0	8.11	27.0	32.9	0.90	19.82	<0.001
Marines, Calif.	3	66.7	33.3	0.0	0.0	0.0	0.0	0.0	0.0
Marines, S. C.	280	3.57	8.21	43.2	25.7	0.0	1.43	0.36	17.50
Army, S. C.	4	0.0	0.0	0.0	0.0	0.0	25.0	0.0	75.0
Army, Ky.	22	0.0	4.6	0.0	4.6	0.0	4.6	36.4	50.0
Army, Mo.	36	2.78	8.33	5.56	30.6	5.56	2.78	5.56	38.89
Army, Okla.	18	33.3	11.1	0.0	5.6	0.0	0.0	0.0	50.00
Air Force, Tex.	101	9.90	0.99	0.0	0.99	0.0	11.9	30.7	45.54
Antibiotic resistance
Erythromycin	43	4.65	0.0	0.0	0.0	0.0	0.0	65.12	30.23	<0.001
Tetracycline	31	3.23	0.0	3.23	0.0	0.0	0.0	0.0	93.54	<0.001

^aOther category includes the following emm types: emm12 (n = 22), emm22 (n = 13), emm11 (n = 19), emm5 (n = 14), emm89 (n = 15), emm28 (n = 19), emm18 (n = 10), emm27L/77 (n = 14), emm4 (n = 9), emm58 (n = 3), emm73 (n = 6), emm82 (n = 2), emm96 (n = 3), emm9 (n = 6), and 20 additional types with n = 1 each.

^bP values are based on the Monte Carlo estimate for the Pearson chi-square exact test.