Table 1 Frequencies of underlying and contributing causes of death reported on death certificate.

Disease category		Patients (n = 249)		Controls (n = 1245)		p
Respiratory tract		70 (28.1)		260 (20.9)		0.012*
Cardiac		72 (28.9)		540 (43.4)		<0.001*
Malignant		22 (11.2)		339 (27.2)		<0.001*
Cerebrovascular		25 (10.0)		227 (18.2)		0.002*
Gastrointestinal		12 (4.8)		67 (5.4)		0.72
Neurological, not MG		11 (4.4)		50 (4.0)		0.78
Diabetes mellitus		13 (5.2)		86 (6.9)		0.33
Urinary tract		4 (1.6)		44 (3.5)		0.12

Number (%) is given for each group (patients or controls). The two groups were compared with the Pearson χ² test. *Statistical significance.