Table 3. Means, standard deviations, and correlations among variables.

Variables	Mean	SD	1	2	3	4	5	6
OS	5.37	2.45
Disulfide (μmol/l)	18.6	5.3	0.341*
Native thiol (μmol/l)	288.9	74.8	0.345*	0.213*
Total thiol (μmol/l)	326.3	78.4	0.388*	0.366*	0.987±
Native thiol/disulfide	16.8	7.5	−0.073	−0.693±	0.545±	0.434±
KPS	80 (40–90)†		0.156	0.096	−0.421*	0.407*	0.185
Age	61.8	7.9	−0.314*	−0.102	−0.084	−0.047	−0.148	−0.358*

*P < 0.05.

^±P < 0.001.

^†Median value (min − max).

SD, standard deviations; OS, overall survival; KPS, Karnofsky performance status.