Table 3. Haplogroup Frequencies.

Haplogroup	Screening Phasea		Extension Phaseb		Patients with optic nerve involvementc
	MS % (n = 159)	Controls % (n = 671)	MS % (n = 994)	Controls % (n = 1506)	MS % (n = 673)	Controls % (n = 1506)
H	44.03	47.24	43.36	44.49	43.98	44.49
J	11.32	14.46	10.16	12.62	8.77	12.62
K	8.18	8.79	10.76	9.56	11.44	9.56
T	9.43	10.13	7.75	10.16	7.58	10.16
U	15.09	9.54	14.29	11.62	14.41	11.62
Other	11.95	9.84	13.68	11.55	13.82	11.55

^ap = 0.3450.

^bp = 0.0194.

^cp = 0.0073.