Prevalence of asthma, its correlates, and validation of the Pre-School Asthma Risk Factors Scale (PS-ARFS) among preschool children in Lebanon

Objectives: The Asthma Risk Factor Scale (ARFS) is used to screen for asthma in Lebanese pre-school children (aged 3–16 years). The study objective was to describe factors associated with asthma, confirm ARFS score validity among Lebanese preschool children, and develop a risk score for asthma diagnosis in this age group (Pre-School Asthma Risk Factor Scale [PS-ARFS]). Methods: A cross-sectional study enrolled 515 preschool children (November 2018 and March 2019). The ARFS is a 15-item tool that assesses children’s environmental exposure, parental history of asthma, and dietary habits.Results: The percentage of asthmatic children was 8.2%. Higher odds of asthma in children were associated with living near a prairie sprayed with pesticides (odds ratio [OR] = 2.33), playing out-doors (OR = 2.89), having a heater in the bedroom (OR = 10.73), attending a nursery (OR = 2.91), having a mother who smokes cigarettes (OR = 3.35) or water pipe (OR = 2.46), a sister with a history of seasonal allergy (OR = 6.81), and a parental history (mother and father) of asthma (OR = 6.15 and OR = 9.83, respectively). Higher ARFS scores (OR = 1.144) were associated with higher odds of asthma. Accordingly, the PS-ARFS was created according to the following formula: ARFS score + (playing out-door × 2.4) + (heating system in the bedroom × 12.9) + (having attended a nursery × 2.5) (area under the curve = 0.908 [0.860–0.957]; P < 0.001); at value: 14.20, Se = 84.3% and Sp = 90.9%.Conclusion: PS-ARFS is suggested for screening of asthma in preschool children in an epidemiological setting and in the absence of spirometry.