Table 2.
Characteristics of the selected cohort studies in detail.
| Author | Year | Duration | Population | Cases | Controls | Age Range | PD Assessment | Sub Type | HR (95% CI) |
|---|---|---|---|---|---|---|---|---|---|
| Michaud [23] | 2008 | 18 | USA | 7863 | 40,512 | 40–75 | Self-reported periodontitis | OPC | 1.15 (0.73–1.81) |
| Chung [20] # | 2016 | 5 | Taiwan | 40,140 | 40,140 | 54.1 ± 11.5 | Diagnosis of chronic periodontitis | OC (ICD-9-CM code 140–149) | 1.20 (1.09–1.33) |
| Michaud [22] | 2016 | 26 | USA | 1768 | 17,554 | 40–75 | Self-reported periodontitis | OPC | 2.25 (1.30–3.90) |
| Nwizu [21] | 2017 | USA | 17,103 | 48,766 | 68.3(Mean) | Self-reported periodontitis | Lip, oral cavity and pharynx | 1.10 (0.64–1.87) |
Abbreviations: OPC—Oropharyngeal cancer, HNSCC—Head and Neck Squamous Cell Carcinoma, OPSCC—Oropharyngeal Squamous Cell Carcinoma. # included in meta-Analysis.