Number of items missing	Calculation to account for missing items	Dyspnoea-12 score calculation
1	36 ÷ 33 = 1.09	1.1× total Dyspnoea-12 score
2	36 ÷ 30 = 1.2	1.2× total Dyspnoea-12 score
3	36 ÷ 27 = 1.3	1.3× total Dyspnoea-12 score