Hakim 2000.

Study characteristics
Methods	PCC in USA
Participants	Participants: 234 (male/female: 138/96) cases and 216 (male/female: 125/91) controls Inclusion criteria: aged ≥ 30 years, histopathologically confirmed squamous cell carcinoma of the skin diagnosed within 4 months before the 1st interview and had no prior history of a skin cancer, non‐Hispanic and Hispanic white cases' ethnicity from Southeastern Arizona Skin Cancer Study, Arizona, USA. Recruitment: from January 1993‐December 1996
Interventions	N/A
Outcomes	Number of cases Skin cancer: 234 (138/96) cases of squamous cell carcinoma
Green tea in exposure categories	Exposure assessment: intake of hot green tea Lowest exposure: nondrinker Highest exposure: drinker, merging all categories (1–3 cups/month, 1–6 cups/week and ≥ 1 cup/d)
Notes	Funding: grant from Unilever Health Institute Vlaardingen, the Netherlands and by Public Health Service Grant P01 CA27502 Statistical methods: unconditional logistic regression Variables controlled in analysis: age, sex, energy intake, inability to tan after prolonged sun exposure and history of diagnosed and treated actinic keratosis Variables controlled by matching: sex and age (± 10 years)