Table 2. The prevalence a of bronchial wall thickening among different asthma severities.

Parameters	Mild asthma, n (%)	Moderate asthma, n (%)	Severe asthma, n (%)	Total, n (%)
BWT*	9 (30.00)	15 (45.50)	47 (78.30)	71 (57.70)
Severity of BWT
Mild	8 (26.70)	12 (36.40)	31 (51.70)	51 (41.50)
Moderate	1 (3.30)	3 (9.10)	16 (26.70)	20 (16.30)
Severe	0 (0.00)	0 (0.00)	0 (0.00)	0 (0.00)

*, significant difference was found in prevalence of BWT among different asthma severity groups (P<0.05). BWT, bronchial wall thickening.