RE: “POPULATION DENSITY IN HIROSHIMA AND NAGASAKI BEFORE THE BOMBINGS IN 1945: ITS MEASUREMENT AND IMPACT ON RADIATION RISK ESTIMATES IN THE LIFE SPAN STUDY OF ATOMIC BOMB SURVIVORS”

In the article “Population Density in Hiroshima and Nagasaki Before the Bombings in 1945: Its Measurement and Impact on Radiation Risk Estimates in the Life Span Study of Atomic Bomb Survivors” by French et al. (1), a coding error led to minor errors in the estimated associations of radiation dose and population density with risk of first primary solid cancer (Table 3 and Web Table 5). These errors do not substantively change the conclusions.

In the original article, the authors reported that the “sex-averaged [excess relative risk] per [Gray] increase in weighted absorbed colon dose was 0.459” (1, p. 1626). The corrected estimate is 0.476. In addition, the original estimates printed in Table 3 (p. 1627) are shown below.

Model	Radiation Dose		Population Density		AIC
	ERR	95% CI	RR	95% CI
Base	0.459	0.376, 0.545			91,047.1
With density	0.451	0.366, 0.538	1.007	0.991, 1.023	91,048.3
With density ×  age	0.448	0.362, 0.537			91,052.4
<10 years			0.998	0.966, 1.030
10–14 years			1.019	0.991, 1.046
15–29 years			1.005	0.985, 1.026
≥30 years			1.008	0.988, 1.030

The online version of the article has been updated with the values below.

Model	Radiation Dose		Population Density		AIC
	ERR	95% CI	RR	95% CI
Base	0.476	0.389, 0.566			91,045.5
With density	0.468	0.380, 0.560	1.007	0.991, 1.023	91,046.9
With density ×  age	0.465	0.376, 0.558			91,051.0
<10 years			0.997	0.966, 1.030
10–14 years			1.018	0.991, 1.046
15–29 years			1.005	0.985, 1.025
≥30 years			1.008	0.987, 1.029

In addition, the Web Material has also been updated.

The authors regret these errors.