Table 1.
Characteristics of studies between tea consumption and thyroid cancer risk
| Author (year) | Country | Study design | Quality score | Participants (case) | Age range | RR (95% CI) for highest vs. lowest category |
|---|---|---|---|---|---|---|
| D’Avanzo et al. (1995) | Italy | HCC | 6 | 1016 (399) | ≤ 75 | 1.13 (0.82-1.56) |
| Galanti et al. (1997) | Norway | PCC | 7 | 312 (116) | 18-75 | 1.16 (0.51-2.65) |
| Glattre et al. (1993) | Norway | HCC | 7 | 552 (92) | 20-59 | 1.33 (0.61-2.90) |
| Hallquist et al. (1993) | Sweden | PCC | 6 | 540 (180) | 20-70 | 0.93 (0.59-1.48) |
| Kolonel et al. (1990) | United States | PCC | 7 | 632 (191) | ≥18 | 0.75 (0.52-1.08) |
| Linos et al. (1989) | Greece | HCC | 7 | 141 (70) | Na | 0.76 (0.43-1.33) |
| Mack et al. (2002) | United States | PCC | 6 | 584 (292) | 15-54 | 0.3 (0.1-1.0) |
| Michikawa et al. (2011) | Japan | Cohort | 8 | 100507 (159) | 40-69 | Females: 0.91 (0.56-1.48) |
| Males: 0.71 (0.22-2.28) | ||||||
| Preston-Martin et al. (1987) | United States | PCC | 7 | 220 (110) | 15-40 | 0.51 (0.25-1.03) |
| Preston-Martin et al. (1993) | China | PCC | 7 | 414 (207) | 18-54 | 1.00 (0.25-4.03) |
| Riza et al. (2015) | Greece | HCC | 6 | 1529 (1139) | 42.8 | Chamomile tea |
| 0.25 (0.10-0.62) | ||||||
| Sage tea | ||||||
| 0.34 (0.09-1.21) | ||||||
| Mountain tea | ||||||
| 0.55 (0.21-1.41) |
Abbreviations: Na: not available; PCC: population-based case-control study; HCC: hospital-based case-control study; BMI: body mass index.