Table 2

Observed/expected rates of skin cancer in xeroderma pigmentosum patients by age

Attained age (years)	Selected events	Observed	Expected	O/E^*	95% CI lower	95% CI upper
<10	All skin cancers	40	0.01^†	5434	3882	7400
<10	NMSC	36	0.00^†	11139	7802	15421
<10	Melanoma	4	0.00^†	969	264	2480
10–19	All skin cancers	31	0.01^†	5229	3553	7422
10–19	NMSC	21	0.00^†	8043	4979	12294
10–19	Melanoma	10	0.00^†	3014	1446	5544
20–39	All skin cancers	26	0.11^†	239	156	351
20–39	NMSC	7	0.01^†	525	211	1082
20–39	Melanoma	19	0.10^†	199	120	311
Total	All skin cancers	98	0.37^†	264	214	322
Total	NMSC	64	0.20^†	327	252	418
Total	Melanoma	34	0.18^†	193	134	270

↵* All values were p<0.05.
↵† The required age or year was not found in the referent rate table, therefore the closest age/year was used to obtain the rate.
O/E, observed/expected ratio; NMSC, non-melanoma skin cancer.