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Ischemic Stroke and Temperature Decrease

Hong, Yun-Chul; Rha, Jong-Ho; Lee, Jong-tae; Ha, Eun-Hee; Kwon, Ho-Jang; Kim, Ho

doi: 10.1097/01.ede.0000100146.24974.ef
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Department of Occupational and Environmental Medicine, Inha University College of Medicine, Incheon, Korea (Hong)

Department of Neurology, Inha University College of Medicine, Incheon, Korea (Rha)

Department of Preventive Medicine, Ewha Womans University college of Medicine, Seoul, Korea (Lee, Ha)

Department of Preventive Medicine, Dankook University College of Medicine, Cheonan, Korea (Kwon)

Department of Epidemiology and Biostatistics, School of Public Health, Institute of Public Health and Environmental Sciences, Seoul National University, Seoul, Korea, hokim@snu.ac.kr (Kim)

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The authors respond:

We appreciate Dr. Stang’s1 interest in our paper2 on the association of ischemic stroke with a decrease in temperature. As he pointed out, our tables show odds ratios based on the interquartile range of daily average temperature (17.4°C). We agree that it would have been more appropriate to express the odds ratios associated with a temperature change within a bound of daily variation (eg, 5°C). We have recalculated the odds ratios for 5°C temperature decrease; we present these results in Tables 1 and 2, which correspond to Tables 2 and 3 in the original paper.2

TABLE 1

TABLE 1

TABLE 2

TABLE 2

We made a mistake in the second paragraph of the “Results” section in stating that “confidence interval did not include 1.0 after 2 or more days after exposure.”2(p.474) It should be “confidence interval included 1.0 after 2 or more days after exposure.”

We tried to comply with the policy of the journal Epidemiology3,4 by using the estimates of the odds ratios and their confidence intervals rather than statistical testing. It was not our intention to mislead readers. We trust that the additional tables will be useful.

Yun-Chul Hong

Department of Occupational and Environmental Medicine

Inha University College of Medicine

Incheon, Korea

Jong-Ho Rha

Department of Neurology

Inha University College of Medicine

Incheon, Korea

Jong-tae Lee

Eun-Hee Ha

Department of Preventive Medicine

Ewha Womans University college of Medicine

Seoul, Korea

Ho-Jang Kwon

Department of Preventive Medicine

Dankook University College of Medicine

Cheonan, Korea

Ho Kim

Department of Epidemiology and Biostatistics

School of Public Health

Institute of Public Health and Environmental Sciences

Seoul National University

Seoul, Korea

hokim@snu.ac.kr

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REFERENCES

1.Stang A. Ischemic stroke and temperature decrease. Epidemiology. 2004;15:126.
2.Hong Y-C, Rha J-H, Lee J-T, et al. Ischemic stroke associated with decrease in temperature. Epidemiology. 2003;14:472–478.
3.Lang JM, Rothman KJ, Cann CI. That confounded p-value. Epidemiology. 1998;9:7–8.
4.The editors. The value of p. Epidemiology. 2001;12:286.
© 2004 Lippincott Williams & Wilkins, Inc.