Serum Nickel and Titanium Levels after Transcatheter Closure of Atrial Septal Defects with Amplatzer Septal Occluder

Table 1

Statistical evaluation of serum nickel levels.

Variable	Median	Percentile 25	Percentile 75	value
Preimplantation	0.44	0.00	0.82	<0.0001
24th hour	1.01^‡,§	0.30	2.04
1st month	1.72^‡,§	0.96	1.98
3rd month	1.96^‡,§	0.54	2.18
6th month	1.08^¶	0.05	2.10
12th month	0.52	0.00	1.04

The nonnormally distributed data for repeated observations were compared by Friedman test. When significant differences were determined, multiple comparisons were carried out using Bonferroni-corrected Wilcoxon test. ^‡Significantly different from preimplantation; ^§Significantly different from 12th month; ^¶Significantly different from 1st month (; Bonferroni-corrected Wilcoxon test); value of the Friedman test.