Table 3—

Cause of medical visit, β2-agonist usage, recent evolution of asthma and emergency care visit during the previous month according to inhalation technique and coordination

Good usersMisusers without poor coordinationMisusers with poor coordination
Cause of medical visit
 Routine or first visit817769
 Emergency or worsened asthma192431
β2-agonist usage >1·day−1263642
 Evolution rated as unstable or worsened364662
  • Data are presented as percentages

  • p<0.002 for all comparisons