Table 1.

Descriptions of patients and tumors in the nonmelanoma skin cancer database

	Registration from Jan 1 2008 – Aug 31 2009 in the NMSC database (%)	Study population for calculation of completeness: Registration from Jan 1 – Jun 30 2008 (%)	Medical record reviews used to calculate PPV and completeness (%)
Total numbers of patients	1,775	288	67
Male	892 (50)	136 (47)	31 (46)
Female	883 (50)	152 (53)	36 (54)
Clinics
Clinic no 1	457	178 (62)	39 (58)
Clinic no 2	296	110 (38)	28 (42)
Age < 55	264 (15)	49 (17)	16 (24)
Age ≥ 55 and <75	889 (50)	154 (53)	29 (43)
Age ≥ 75	622 (35)	85 (30)	22 (33)
History of previous skin cancer
No history of skin cancer	992 (56)	156 (54)	32 (48)
History of previous skin cancer	737 (42)	130 (45)	34 (51)
Unknown	45 (3)	2 (1)	1 (2)
Missing	1 (–)	0	0
Total numbers of tumors	2,400	359	78
Histological diagnosis
Basal cell carcinoma	2,090 (87)	328 (91)	72 (92)
Squamous cell carcinoma	123 (5)	10 (3)	2 (3)
Mb. Bowen	77 (3)	9 (3)	2 (3)
Keratoacanthoma	34 (1)	7 (2)	2 (3)
Keratoacanthoma/SCC	1 (–)	1 (–)	0
No pathology test performed	57 (2)	4 (1)	0
Histology inconclusive	10 (–)	0	0
Missing histology registration	8 (–)	0	0
Tumor registered is
A new primary tumor	2,173(91)	324 (90)	69 (88)
A previously treated tumor	221 (9)	35 (10)	9 (12)
Missing	6 (–)	–	–
Treatment modality
Curettage with or without cautery	1,919 (80)	294 (82)	65 (83)
Cryotherapy	38 (2)	3 (1)	0
Excision	157 (7)	9 (3)	1 (1)
Tangential excision with or without curettage	4 (–)	1 (–)	0
Photodynamic therapy	55 (2)	15 (4)	1 (1)
Imiquimod	42 (2)		1 (1)
Referred to hospital treatment	152 (6)	28 (8)	9 (11)
No treatment	17 (–)	1 (–)	0
Treatment variable missing	16 (1)	6 (2)	1 (1)

Abbreviations: PPV, positive predictive value; SCC, squamous cell carcinoma.