Table 2.

Incidence rate and hazard ratios for prostate cancer in sample patients during the 5-year follow-up period starting from the index date (n = 11 605)

Variable	Totalsample No. (%)	Subjects with sexuallytransmitted infections No. (%)	Comparisonsubjects No. (%)
Five-year follow-up period
Presence of prostate cancer	110 (0·95)	19 (1·80)	91 (0·86)
Incidence rate per 1000 person-years (95% CI)	1·90 (1·57–2·28)	3·60 (2·23–5·52)	1·73 (1·40–2·11)
Crude hazard ratio† (95% CI)	—	2·11** (1·28–3·47)	1·00
Adjusted hazard ratio‡ (95% CI)	—	1·95** (1·18–3·23)	1·00

CI, Confidence interval.

^†Hazard ratio was calculated by the stratified Cox regression model (stratified on age group).

^‡Adjustments are made for patients' geographical location, urbanization level, monthly income, history of vasectomy, chronic prostatitis, hypertension, diabetes, hyperlipidaemia, obesity, tobacco use disorder, and alcohol abuse/alcohol dependence syndrome.

^**P < 0·01.