Comparison of five-year survival rates among patients with oral squamous cell carcinoma with and without association with syphilis: a retrospective case-control study

Table 1 Patient characteristics before and after matching of cohorts I (ICD-10 codes C01–06 and A51–53) and II (ICD-10 codes C01–06 without A51–53)

Patients (n)	Before matching				After matching
Patients (n)	Cohort I	Cohort II	p- value	Standardized mean difference	Cohort I	Cohort II	p-value	Standardized mean difference
Total	199	73,544			199	199
Male	155 (77.89%)	49,015 (66.65%)	< 0.05	0.2531	155 (77.89%)	156 (78.39%)	0.90	0.0121
Female	44 (22.11%)	24,488 (33.25%)	< 0.05	0.2519	44 (22.11%)	43 (21.61%)	0.90	0.0121
Mean current age (years)	62.79	68.18	< 0.05	0.3956	62.79	62.90	0.93	0.0082
Standard deviation	13.52	13.73			13.52	13.31
Minimum	7	0			7	7
Maximum	90	90			90	90
Mean age at diagnosis	57.51	61.94	< 0.05	0.3207	57.51	57.61	0.93	0.0077
Standard deviation	13.64	13.97			13.64	13.43
Minimum	4	0			4	4
Maximum	90	90			90	90

Percentage refers to gender distribution within the respective cohorts. P-value refers to comparison between both cohorts (Log-Rank test)
Abbreviations: ICD International Classification of Diseases

ISSN: 1471-2407