Study on the efficacy of early treatment with pirfenidone on the lung function of patients with idiopathic pulmonary fibrosis

Table 2 Incidence of adverse reactions (nausea, vomiting, anorexia) compared among the three groups of patients

Group	Number of cases	Nausea	Vomiting	Anorexia	Frequency of adverse reactions
Observation group	60	1	1	0	3.33
Later treatment group	55	2	1	2	9.09
Control group	53	3	3	3	16.98
χ²					5.864
P value					0.021