A diagnostic bias might be a much simpler explanation for the apparently elevated risk for nasopharyngeal cancer with respect to formaldehyde

Table 1 Incidence and Mortality 2003–2007, Connecticut, Males

Entity	ICD-10	Incidence^a		UCD^b		MCD^c		M/I^d
		N	AS(W)^e	N	ASR^f	N	ASR^f
Tonsil	C09	271	2.3	26	0.29	28	0.31	0.10
Other oropharynx	C10	55	0.5	26	0.30	33	0.39	0.47
Nasopharynx	C11	63	0.6	19	0.22	24	0.29	0.30
Hypopharynx	C12-C13	128	1.1	18	0.21	21	0.25	0.14
Pharynx, unspecified	C14	21	0.2	55	0.64	71	0.83	2.62
Nose, sinuses, etc.	C30-C31	65	0.5	8	0.11	9	0.11	0.12
Pharynx	C09-C14	538	4.7	144	1.66	177	2.07	0.27

^a- from IARC (2014) Cancer in Five Continents, Vol. X
^b- Underlying cause of death; from CDC, National Center for Health Statistics, Underlying Cause of Death 1999–2014 on CDC WONDER Online Database, released 2015. Accessed at https://wonder.cdc.gov/ucd-icd10.html on Jan 14, 2016
^c- Multiple cause of death; from CDC, National Center for Health Statistics, Multiple Cause of Death 1999–2014 on CDC WONDER Online Database, released 2015. Accessed at https://wonder.cdc.gov/mcd-icd10.html on Jan 14, 2016
^d- Ratio between absolute numbers of cases for underlying cause of death and incidence
^e- age-standardized rate (world population)
^f- age-standardized rate (2000 U.S. Std. Population)

ISSN: 1745-6673