Table 3

Loadings of the track

ItemsItem loading
Frequency of respiratory symptoms in the past 4 weeks0.82
Frequency of sleep disrupted in the past 4 weeks0.83
Activity limitations in the past 4 weeks0.82
Frequency of rescue medicine use in the preceding 3 months0.55
Systemic corticosteroids or high-dose inhaled corticosteroid use in the previous year0.48
  • Eigen value: 2.38, variance explained: 52.51%.