Ethylene Oxide: Acute Four-Hour and One-Hour Inhalation Toxicity Testing in Rats

Table 6

LC₅₀ calculations reported in ppm by volume and converted to mg/m³.

	Unit of measurement	4-hour LC50; (95% confidence limits)	1-hour LC50; (95% confidence limits)	Ratio 1-hour/4-hour
Males	ppm	1972 (1887–2061)	5748 (5276–6262)	2.9
	mg/m^3	3550 (3397–3710)	10346 (9497–11272)	2.9
Females	ppm	1537 (1391–1698)	4439 (4034–4884)	2.9
	mg/m^3	2767 (2504–3056)	7990 (7261–8791)	2.9
Combined sexes	ppm	1741 (1655–1831)	5029 (4634–5459)	2.9
	mg/m^3	3134 (2979–3296)	9052 (8341–9826)	2.9