Do Herbal Formulas Influence the International Normalized Ratio of Patients Taking Warfarin? A Retrospective Study

Table 2

Changes in the international normalized ratio between the herbal and nonherbal groups.

	Herbal group ( = 45)	Nonherbal group ( = 41)	value
INR greater than 3 (%)	9 (20.0)	16 (39.0)	0.052
INR less than 2 (%)	27 (60.0)	17 (41.5)	0.086
INR changed by one or more units (%)	12 (26.7)	11 (28.8)	0.986
INR increased by one or more units (%)	7 (15.6)	6 (14.6)	0.905
INR decreased by one or more units (%)	5 (11.1)	6 (14.6)	0.625
Mean INR (mean ± SD)	2.3 ± 0.4	2.4 ± 0.4	0.032

INR: international normalized ratio.
Data are expressed as number or mean ± standard deviation; < 0.05 was considered significant. Statistical analysis by Pearson’s Chi-square test.