Estimates of the prevalence of asthma in the adult population. The air passages in the lungs become narrow due to inflammation and tightening of the muscles around the small. Department Of Statistics Malaysia Official Portal Asthma prevalence and the relationship between level of knowledge and quality of life among asthmatic schoolchildren in Malaysia - PMC Journal List Saudi Med J v43 1. . The adjusted prevalence of asthma ranged from 44 95 CI. Asthma Call Back survey. Based on self-rated health status 55 of patients were reported to be. The prevalence in Malaysia is not known but it is a common illness and up to 5 of admissions to our medical wards in Penang are due to acute attacks of asthma. Its incidence is highest in the West and less common in developing countries. Asthma is a type of breathing disorder which if not treated well could cause. According to National Health and Morbidity Survey 2011 the