Modified Dachengqi Decoction Combined with Conventional Treatment for Treating Acute Exacerbation of Chronic Obstructive Pulmonary Disease: A Systematic Review Based on Randomized Controlled Trials

Table 4

Outcome measures for PCO₂ (mmHg).

Study	Treatment (m ± s)	Control (m ± s)	Mean difference (95% CI)	𝑃 value
Fang and Shi, 2006 [9]	67±11	74±13	−7.00 (−14.78,0.78)	𝑃=0.0852
Guo and Liang, 2011 [11]	41.3±5.13	48.26±5.34	−6.96 (−9.61,−4.31)	𝑃<0.0001
Lu, 2010 [18]	41.76±2.1	42.76±2.39	−1.00 (−2.56,0.56)	𝑃=0.2184
Meng, 2012 [20]	65.7±6.3	81.7±8.1	−16.00 (−19.67,−12.33)	𝑃<0.0001
Pang, 2009 [21]	57.54±6.9	62.36±5.76	−4.82 (−7.57,−2.07)	𝑃=0.001
Meta			−4.30 (−5.44,−3.17)	𝑃<0.00001