Table 1 Screening Criteria for Asthma. A positive answer to any of the latter three questions (Q3-Q5) led to classification of the interviewee as a subject with asthma

Q1 Have you been told by your doctor that you suffer from asthma?

□ No

□ Yes

Q2 Have you had one of the following symptoms: wheezing, nocturnal coughing, chest tightness, or breathless ness in the last 12 months

□ No

□ Yes

Q3. Have you had an asthma attack in the last 12 months?

□ No

□ Yes

Q4. Have you used asthma medications in the last 12 months?

□ No

□ Yes

Q5. Have you used Ventolin or inhaled bronchodilators or short acting β agonist in the last 12 months?

□ No

□ Yes

If yes, what is the daily frequency of use?

□ Once

□ Repeated