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Table 8 Comparison of pulmonary function before and after treatment (FEV1)

From: Comprehensive use of a high-frequency electric knife, balloon dilatation, and cryotherapy for tuberculous central tracheobronchial cicatricial constriction

Variable

Wilks’ Lambda

F

P

Internal diameter of tracheal stenosis

 Scar hyperplasia (before treatment vs. Mid-term after treatment vs. Long-term after treatment)

0.041

4.426

0.000

 Repair under scar formation(before treatment vs. Mid-term after treatment vs. Long-term after treatment)

0.032

6.129

0.000

 Mature scars (before treatment vs. Mid-term after treatment vs. Long-term after treatment)

0.054

3.862

0.000