CRP and Pleural effusion: Further analysis using a multivariate logistic regression model and ROC curve showed that a of hospitalization time of ≥ 10.5 days, CRP level of ≥ 25.92 mg/L, LDH level of ≥ 378 U/L, pulmonary lesions involving two or more lung lobes, and a large amount of pleural effusion were risk factors for delayed radiographic resolution of lobar pneumonia caused by M. pneumoniae in children.