Table 2.

Proportion of CD4⁺, CD8⁺, and CD4⁺: CD8⁺ Ratio in the PB of COPD Patients with Different GOLD Stage

Group	Mean age	CD4+cells	CD8+cells	CD4/CD8
Moderate	62.35 ± 1.45	39.72 ± 2.97*	28.91 ± 2.69#	1.84 ± 0.35§
Severe	69.73 ± 2.18	35.88 ± 3.64**	26.34 ± 1.96	1.54 ± 0.29
Extremely severe	74.52 ± 1.85	30.18 ± 1.81	26.27 ± 2.18	1.42 ± 0.15

Data expressed as mean ± SEM.

^*No significant difference compared to the severe group, P > 0.05, significant difference compared to the extremely severe group, P < 0.05.

^**No significant difference compared to the extremely severe group.

^#,§No significant difference existed among the three groups, P > 0.05.