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High-temperature indices associated with mortality and outpatient visits: characterizing the association with elevated temperature.

ABSTRACT: This study aimed to identify optimal high-temperature indices to predict risks of all-cause mortality and outpatient visits for subtropical islanders in warm seasons (May to October). Eight high-temperature indices, including three single measurements (average, maximum and minimum temperature) and five composite indices (heat index, humidex, temperature humidity index, apparent temperature and wet-bulb globe temperature), and their standardized Z scores, were used in distributed lag non-linear models. Cumulative 8-day (lag zero to seven days) relative risks (RRs) and 95% confidence intervals were estimated, 1 and 2 standardized deviations above the medium (i.e., at 84.1th and 97.7th percentile, respectively), by comparing with Z scores for the lowest risks of mortality and outpatient visits as references. Analyses were performed for Taipei in north, Central Taiwan and Southern Taiwan. Results showed that standardized Z-values of high-temperature indices associated with the lowest health risk were approximately 0 in Taipei and Central Taiwan, and -1 in Southern Taiwan. As the apparent temperature was at Z=2, the cumulative 8-day mortality risk increased significantly, by 23% in Taipei and 28% in Southern Taiwan, but not in Central Taiwan. The maximum temperature displayed consistently a high correlation with all-cause outpatient visits at Z=1; with the cumulative 8-day RRs for outpatient visits increased by 7%, 3%, and 4% in the three corresponding areas. In conclusion, this study has demonstrated methods to compare multiple high-temperature indices associated with all-cause mortality and outpatient visits for population residing in a subtropical island. Apparent temperature is an optimal indicator for predicting all-cause mortality risk, and maximum temperature is recommended to associate with outpatient visits. The impact of heat varied with study areas, evaluated health outcomes, and high-temperature indices. The increased extreme heat is associated with stronger risk for all-cause mortality than for outpatient visits.

SUBMITTER: Lin YK

PROVIDER: S-EPMC7127034 | biostudies-literature | 2012 Jun

REPOSITORIES: biostudies-literature

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High-temperature indices associated with mortality and outpatient visits: characterizing the association with elevated temperature.

Lin Yu-Kai YK Chang Chin-Kuo CK Li Ming-Hsu MH Wu Yu-Chung YC Wang Yu-Chun YC

The Science of the total environment 20120509

This study aimed to identify optimal high-temperature indices to predict risks of all-cause mortality and outpatient visits for subtropical islanders in warm seasons (May to October). Eight high-temperature indices, including three single measurements (average, maximum and minimum temperature) and five composite indices (heat index, humidex, temperature humidity index, apparent temperature and wet-bulb globe temperature), and their standardized Z scores, were used in distributed lag non-linear m ...[more]

PMID: 22575378

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Project description:ImportanceTime-based billing options for physicians have expanded, enabling many physicians to bill according to time spent instead of medical decision-making (MDM) level for fee-for-service outpatient visits. However, no study to date has estimated the revenue changes associated with time-based billing.ObjectiveTo compare evaluation and management (E/M) reimbursement for physicians using time-based billing vs MDM-based billing for outpatient visits of varying lengths.Design, setting, and participantsThis economic evaluation used 2019 billing data for outpatient E/M codes and 2021 reimbursement rates from the Centers for Medicare & Medicaid Services. Modeling of generic clinic templates was performed to estimate expected yearly E/M revenues for a single full-time physician working in an outpatient clinic using fee-for-service billing.Main outcomes and measuresYearly E/M revenues for different patient visit templates were modeled. The standardized length of return patient visits was 10 to 45 minutes, and new patient visits were twice as long in duration.ResultsUnder MDM-based billing, increased visit length was associated with decreased E/M revenue ($564 188 for 30-minute new patient visit/15-minute return patient visit vs $423 137 for 40-minute new patient visit/20-minute return patient visit). Under time-based billing, yearly E/M revenue remained similar across increasing visit lengths ($400 432 for 30-minute new patient visit/15-minute return patient visit vs $458 718 for 40-minute new patient visit/20-minute return patient visit). Compared with time-based billing, MDM-based billing was associated with higher E/M revenue for 10- to 15-minute return patient visits ($400 432 vs $564 188). Time-based billing was associated with higher E/M revenue for return patient visits lasting 20 minutes or longer. The highest modeled E/M revenue of $846 273 occurred for 10-minute return patient visits under MDM-based billing.Conclusions and relevanceResults of this study showed that the relative economic benefits of MDM-based billing and time-based billing differed and were associated with the length of patient visits. Physicians with longer patient visits were more likely to experience revenue increases from using time-based billing than physicians with shorter patient visits.

Dataset Information

High-temperature indices associated with mortality and outpatient visits: characterizing the association with elevated temperature.

Publications

High-temperature indices associated with mortality and outpatient visits: characterizing the association with elevated temperature.

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