Ivey et al. 2003. Study authors conduct a retrospective study of patients that presented to the emergency department of hospitals in Trinidad for 1997-1999 (3 years). The investigators looked at climatic variables that may have influenced asthma and found a seasonal effect. A relationship between high RH and low barometric pressure during the rainy season resulted in higher asthma admissions. The authors question the results stating that other rainy season factors that were not included in the study may be responsible for the increase in acute asthma cases.