Table 1.
Summary of studies
| Reference | Country, year of publication | Data collection | Diagnosis* | Total No | No of cases | Age (years) | % male | Exposure† | |
|---|---|---|---|---|---|---|---|---|---|
| Studies included in meta-analysis | |||||||||
| Asgari et al14 | United States, 2011 | 2004-05 | SCC | 830 | 415 | 43-85 | 61.9 | Ever/never | |
| Aubry and McGibbon15 | Canada, 1985 | 1977-78 | SCC | 266 | 92 | Unknown | 65.8 | Ever/never | |
| Bajdik et al16 | Canada, 1996 | 1983-84 | BCC; SCC | 812 | 226 BCC; 180 SCC | 25-79 | 100.0 | Ever/never | |
| Bakos et al17 | Germany, 2011 | 2004-08 | BCC | 50 | 25 | 19-40 | 40.0 | “Regular” exposure | |
| Corona et al19 | Italy, 2001 | 1995-97 | BCC | 324 | 166 | ≥18 | 47.8 | Ever/never | |
| Ferrucci et al20 | United States, 2011 | 2006-10 | BCC | 766 | 376 | <40 | 30.8 | Ever/never | |
| Gon and Minelli21 | Brazil, 2011 | 2006-07 | BCC | 407 | 127 | 18-80 | 41.7 | Ever/never | |
| Han et al22 | United States, 2006 | 1989-98 | BCC; SCC | 1362 | 283 BCC; 275 SCC | 43-68 | 0.0 | Ever/never | |
| Karagas et al25 | United States, 2002 | 1993-95 | BCC; SCC | 1436 | 603 BCC 293 SCC | 25-74 | 59.5 | Ever/never | |
| Rosso et al27 | Switzerland, 1999 | 1994-96 | BCC; SCC | 290 | 120 BCC; 25 SCC | 20-75 | 52.4 | Ever/never | |
| Walther et al28 | Germany, 2004 | 1997-99 | BCC | 624 | 213 | 19-92 | 48.1 | >5 exposures per year‡ | |
| Zhang et al29 | United States, 2012 | 1989-2009 | BCC; SCC | 73 494 | 5506 BCC; 403 SCC | 25-62 | 0.0 | Ever/never§ | |
| Studies not included in meta-analysis | |||||||||
| Boyd et al18 | United States, 2002 | Unknown | BCC | 60 | 30 | 20-40 | 0.0 | No of exposures | |
| Herity et al23 | Ireland, 1989 | 1984-85 | NMSC | 792 | 202 BCC; 194 SCC | Unknown | Unknown | Ever/never | |
| Hogan et al24 | Canada, 1991 | 1989 | Skin cancer¶ | 4820 | 791 BCC; 41 SCC; 15 MM** | 10-56 | 37.3 | Ever/never | |
| O’Loughlin et al26 | Ireland, 1985 | Unknown | NMSC | 242 | 58 BCC; 63 SCC | Unknown | 71.9 | “Often” exposed | |
*BCC=basal cell carcinoma; SCC=squamous cell carcinoma of skin; NMSC=non-melanoma skin cancer (BCC and SCC grouped together in publication); skin cancer (malignant melanoma, BCC, SCC all grouped together in publication).
†Ever/never: measurement of ever exposure to indoor tanning compared with never exposure; “regular” exposure: defined in publication as “regular” exposure to indoor tanning, with no further specifics; “often” exposed: defined in publication as “often” exposed to indoor tanning, with no further specifics.
‡>5 exposures to indoor tanning per year compared with ≤5 exposures per year.
§Ever/never comparison obtained directly from authors.
¶Skin cancer of head and neck.
**MM=malignant melanoma.