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

Table 1 Comparison of the total effective rate of clinical treatment among the three groups

Group	Number of cases	Markedly effective	Effective	Invalid	Total effective rate
Observation group	60	28	30	2	96.67
Later treatment group	55	26	23	6	89.09
Control group	53	25	20	8	84.91
χ²					5.279
P value					0.509