Table 1. Comparison of each index among AECOPD patients with different GOLD stages.

Parameters	GOLD I (n=28)	GOLD II (n=69)	GOLD III (n=124)	GOLD IV (n=31)	P value
AGR	1.74±0.26	1.56±0.37	1.36±0.34	1.22±0.28	<0.001
LogCRP	0.83±0.37	1.03±0.47	1.11±0.46	1.16±0.66	0.024
IgG (g/L)	10.69±2.15	10.98±2.79	11.25±0.46	9.88±0.34	0.450
PA (mg/L)	240.88±5.81	193.23±6.59	169.08±2.51	171.68±6.86	<0.001

Data are presented as mean ± standard deviation. P values of <0.05 indicate a statistically significant difference. The P values were calculated by the Kruskal-Wallis test. AECOPD, acute exacerbation of chronic obstructive pulmonary disease; GOLD, Global Initiative for Chronic Obstructive Pulmonary Disease; AGR, albumin/globulin ratio; LogCRP, logarithm of the serum C-reactive protein; IgG, immunoglobulin G; PA, prealbumin.