Table 1.

Scoring System for CT Images

Severity of BE and BWT		Extent of BE and BWT		Extent of AT
Score	Findings for BE or BWT	Score	Findings for BE or BWT	Score	Description of CT Findings for AT
0	None	0	No involvement	0	No increase in low attenuation on expiratory scan
1	Mild	1	< 1/3 lobe involvement	1	< 1/3 lobe involvement
2	Moderate	2	≥1/3 lobe involvement < 2/3 lobe involvement	2	≥1/3 lobe involvement < 2/3 lobe involvement
3	Severe	3	≥2/3 lobe involvement	3	≥2/3 lobe involvement

Scores were assigned individually for each individual lobe and for each lung separately (right upper, right middle, right lower, left upper, lingula and left lower). The scores from each lobe were added to obtain a composite score for each CT parameter. BE = bronchiectasis. BWT = bronchial wall thickening. AT = air trapping