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Statistical analysis
This protocol is extracted from research article:
Prevalence and prognosis of synchronous distant metastatic tonsil squamous cell carcinomas
Int J Med Sci, Jan 1, 2021; DOI: 10.7150/ijms.50966

Descriptive statistics were used to examine the baseline characteristics of the patients. The primary study outcomes were overall survival (OS) and cancer-specific survival (CSS). OS was defined as time to the date of death due to any cause or the date of last follow-up. CSS was defined as time from initial treatment to death due to cancer. Kaplan-Meier survival curves were compared using the log-rank test. Hazard analysis was conducted using the Cox proportional hazards model. SPSS software, version 22.0 (SPSS, Chicago, IL, USA) was used for additional data processing. A probability value (p value) of < 0.05 was considered statistically significant for all tests.

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