Table 2—

Factor loading across studies and time (varimax rotation) for placebo patients only

Study number (baseline)Week (all studies)
AQLQ activities1111111
AQLQ environment1111111
AQLQ symptoms1,3111111
AQLQ emotions1111111
FEV1 % pred2222222
PEF pm2222222
PEF am2222222
Night-time waking3333333
Night-time β2‐agonist use3333333
Night-time symptoms3,4333,43,44,34,3
Nights without β2‐agonist %3333333
Nights without waking %3333333
Short of breath daytime44444,144
Activity limitation44,14,144,144
ΔPEF am–pm1,4444444
Chest tightness daytime4444444
Wheeze daytime4NoneNone4444
β2‐agonist use daytime4444444
Days without β2‐agonist %4NoneNone4444
  • Factors (1, 2, 3 or 4) onto which each of the 21 items loaded with statistical significance

  • If an item loaded on two factors, the one onto which it loaded most strongly is shown first

  • AQLQ: Asthma Quality of Life Questionnaire

  • FEV1: forced expiratory volume in one second

  • PEF: peak expiratory flow

  • FVC: forced vital capacity

  • FEF: forced expiratory flow