Establishing Reference Values for Peak Expiratory Flow in the Peruvian Population from Primary Care: Contributing to SDG 3

Objective: This study aimed to determine the Peak Expiratory Flow (PEF) values in the Peruvian population of Metropolitan Lima, identify flowmetry values by age groups from 20 to 60 years, and assess the impact of COVID-19 on individuals who did not contract the disease. Method: A descriptive, cross-sectional study was conducted with 316 participants (50.3% males, 49.7% females) aged 20–60 years. All were hemodynamically stable without limiting cardiac or pulmonary pathologies. PEF was measured using the Mini-Wright Peak Flow Meter following standardized procedures. Data were analyzed using descriptive statistics, Wilcoxon signed-rank test, and Chi-square tests, considering p < 0.05 as statistically significant. Results and Discussion: The mean PEF was 542.09 ± 87.44 L/min. Males had significantly higher PEF values than females (575.66 ± 74.87 L/min vs. 508.09 ± 86.32 L/min, p = 0.004). PEF values decreased with advancing age in both sexes. Participants engaging in regular physical activity showed higher PEF values, though not statistically significant. Individuals without a history of COVID-19 had higher PEF values compared to those who recovered from the virus, suggesting potential long-term effects on lung function. Research Implications: Establishing PEF reference values specific to the Peruvian population enhances healthcare professionals' ability to identify individuals at risk of respiratory impairment. The findings support the use of PEF measurement as a practical tool in primary care for early detection and monitoring of respiratory diseases. Originality/Value: This study provides valuable data on PEF values in a Peruvian cohort, addressing a gap in the literature regarding population-specific reference values. By highlighting the influence of age, sex, physical activity, and COVID-19 on PEF, it contributes to improved respiratory health assessment and management in Peru.