Group	n	Sex [n (%)]		Age ( $\bar{x}$ ± s, yrs)	Disease course ( $\bar{x}$ ± s, yrs)
Group	n	Male	Female	Age ( $\bar{x}$ ± s, yrs)	Disease course ( $\bar{x}$ ± s, yrs)
Control	39	23 (61.5)	15 (38.5)	56.05 ± 8.39	7.76 ± 5.66
Study	41	18 (46.3)	22 (53.7)	56.34 ± 12.46	8.40 ± 6.99
x²/t		1.813		−0.121	−0.441
P		0.182		0.904	0.661