Abstract P38 Table 1

Population stratification by dyspnoea grade: *Quartile distribution (Q1, Q2, Q3) where Q2 represents the median value

MRC gradeNumber of casesSpO2 (%) rangeSpO2 (%) quartiles*Corrected* number (%)
“0”1978.5–9990.7, 94.5, 96.219 (22)
15183.5–9893.6, 95.5, 96.551 (60)
21580.8–9885.6, 90.5, 93.115 (18)
3289–92.589.1, 89.2, 90.80
4195–9595.0, 95.0, 95.00
500
  • * Excludes patients with severe pulmonary hypertension (n =2), or severe emphysema (n = 1).