Table 5.

Follow-up times and incidence of all-cause death in lung cancer patients by serum SOD total activity and serum SOD1 and SOD2 concentrations.

Parameters	Person Months	Number of Events	Incidence Rates *	Median (Range) of Follow Up Time
Overall	7434.35	100	13.45	45.42 (0.23–85.81)
Serum total SOD activity < median	2847.94	42	14.75	36.30 (0.39–85.81)
Serum total SOD activity > median	3080.32	44	14.28	46.52 (0.23–80.52)
Serum SOD1 concentration < median	3842.83	38	9.89	47.51 (1.94–78.35)
Serum SOD1 concentration > median	3586.13	61	17.01	28.50 (0.23–85.81)
Serum SOD2 concentration < median	3052.47	37	12.12	48.13 (2.04–79.40)
Serum SOD2 concentration > median	3129.96	49	15.66	33.60 (0.23–85.81)

SOD: superoxide dismutase; SOD1: superoxide dismutase 1; SOD2: superoxide dismutase 2; *: per 1000 person months; event (endpoint) was defined as all-cause mortality in lung cancer patients.