Table 6.

Pairwise Comparison of Serum Copper Levels Between Healthy Individuals and Patients With Alzheimer’s Disease of Varying Severity.^a

Groups	Mean Difference (μmol/L)	q	P Value
1, 2	−0.58	0.69	.788
1, 3	−3.99	3.63	.037
1, 4	−4.97	4.15	.014
2, 3	−3.41	3.34	.050
2, 4	−4.39	4.01	.025
3, 4	−0.98	2.48	.199

Abbreviations: AD, Alzheimer’s disease; HC, healthy control.

^aGroup 1 represents HC group, group 2 is mild AD group, group 3 is moderate AD group, and group 4 is severe AD group. The pairwise comparison was performed for all permutations of the groups.