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Table 1 Study characteristics of published cohort and case-control studies on tea consumption and bladder cancer

From: Tea consumption and risk of bladder cancer: a meta-analysis

Authors and year Study design Country Study period Cases/ subjects Anatomical site of urinary tract Tea type Variables of adjustment Tea drinking assessment
Ros et al. [40] Cohort European countries 1992-2000 513/233,236 Urinary tract Tea Age, sex, smoking status Questionnaire
Hemelt et al. [39] HCC China 2005-2008 419/384 (green tea) Bladder Green tea Age, sex, smoking status, smoking frequency, and smoking duration adjusted odds ratios Questionnaire
408/385 (black tea) Black tea
Kurahashi et al. [38] Cohort Japan 1990-2005 164/49,566 (men) Bladder Green tea Age, area, smoking status, alcohol and coffee consumption Questionnaire
42/54,874 (women)
Jiang et al. [37] PCC US 1987-1999 1,586/1,586 Bladder Tea Age, sex, race, level of education, use of NSAIDs, carotenoid intake, number of years as hairdresser/barber, cigarette smoking status, duration of smoking, and intensity of smoking. Questionnaire
Stefani et al. [36] HCC Uruguay 1996-2000 255/501 Bladder Tea Age, sex, residence, urban/rural status, education, family history of bladder cancer among first-degree relatives, body mass index, occupation, smoking status, years since quitting, number of cigarettes smoked per day, maté drinking, soft drink intake, milk intake, and, coffee drinking Both
Wakai et al. [35] HCC Japan 1994-2000 124/744 Urinary tract Green tea Age, sex, cumulative consumption of cigarettes, year of first visit Questionnaire
Black tea
Woolcott et al. [34] PCC Canada 1992-1994 927/2118 Bladder Tea Age, sex, education level, current smoking, cumulative smoking, and intake of energy, calcium, fibre and beer Questionnaire
Zeegers et al. [33] Cohort Netherland 1986-1992 569/3,123 Bladder Tea Age, sex, number of cigarettes/day, years of cigarette smoking, and coffee consumption Questionnaire
Geoffery-Perez et al. [32] HCC France 1984-1987 765/765 Bladder Tea Age, sex smoking, residence, center Interview
Bianch et al. [30] PCC USA 1986-1989 1,452/2,434 Bladder Tea Age, sex, education, smoking status, family history of bladder cancer, high risk occupation, total beverage consumption, years of chlorinated surface water, vegetable and coffee consumption Questionnaire
Nagano et al. [31] Cohort Japan 1979-1981 114/3,8540 Bladder Green tea Age, gender, radiation dose, smoking status, education level, body-mass index, and calendar time Questionnaire
Black tea
Lu et al. [28] HCC Taiwan 1996-1997 40/160 Bladder Tea age, sex, date of admission, family history, ethnicity, and smoking status. Questionnaire
Michaud et al. [29] Cohort US 1986-1996 252/47,909 Bladder Tea Geographic region, age, pack-years of smoking, current smoking status, energy intake, intake of fruits and vegetables, and intake of all other beverages. Questionnaire
Bruemmer et al. [27] PCC US 1987-1990 262/405 Bladder Tea Age, sex, smoking, county Interview
Chyou et al. [26] Cohort US 1965-1968 96/7,995 Urinary tract Green tea Age, smoking Both
Black tea
Kunze et al. [25] HCC Germany 1977-1985 675/675 Urinary tract Black tea Age, sex, smoking Interview
D’Avanzo et al. [24] HCC Italy 1985-1990 555/855 Bladder Tea Age, sex, education, smoking habits, alcohol drinking and exposure to occupational risk Interview
Nomura et al. [23] PCC US 1977-1986 261/522 Urinary tract Black tea Age, sex, pack-years of cigarette smoking Interview
Clavel et al. [22] HCC France 1984-1987 690/690 Bladder Tea Age, sex, smoking Interview
Slattery et al. [18] PCC US 1977-1982 419/889 Bladder Tea Age, sex, smoking status, diabetes and bladder infection Interview
Risch et al. [21] PCC Canada 1979-1982 876/1,668 Bladder Tea Age, sex, residence, and lifetime cigarette consumption. Interview
Jensen et al. [20] PCC Denmark 1979-1981 371/771 Bladder Tea Age, sex, smoking status, Interview
Ohno et al. [19] PCC Japan 1976-1978 293/589 Urinary tract Black tea Age, smoking Interview
  1. PCC: population-based case-control study, HCC: hospital-based case-control study, NSAIDs: non-steroidal anti-inflammatory drugs, Both: questionnaire and interview.