Notice of RetractionCox Regression Method to Study Safe Work Time in Hot and Humid Environments

Heat-related disorders, productivity falling and safety problems are common phenomena when people working in hot and humid environments. In this research, the physiological parameters (oral temperature, heart rate and blood pressure) of people working in hot and humid environments were obtained. Based on the physiological limits, the safe work times in different conditions were determined. Then Cox regression method was adopted to determine and rank the significant covariates. The hazard function, survival function curve and hazard function curve were also obtained. The results show the effectives of Cox regression method in analyzing safe work time in hot and humid environments.