Table 5.

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

Groups	Mean Difference (μmol/L)	q	P Value
1, 2	2.17	1.81	.392
1, 3	1.29	1.13	.526
1, 4	−5.20	4.08	.015
2, 3	−0.88	0.92	.813
2, 4	−7.37	4.30	.009
3, 4	−6.49	4.10	.015

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

^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.