Table 3.

Incidence rate and hazard ratios for prostate cancer in the sample patients without a history of chronic prostatitis during the 5-year follow-up period (n = 11 438)

Variable	Totalsample No. (%)	Subjects with sexuallytransmitted infections No. (%)	Comparisonsubjects No. (%)
Five-year follow-up period
Presence of prostate cancer	101 (0·88)	17 (1·69)	84 (0·80)
Incidence rate per 1000 person-years (95% CI)	1·77 (1·45–2·14)	3·39 (2·04–5·32)	1·61 (1·29–1·98)
Crude hazard ratio† (95% CI)	—	2·13** (1·26–3·59)	1·00
Adjusted hazard ratio‡ (95% CI)	—	1·99* (1·17–3·38)	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, hypertension, diabetes, hyperlipidaemia, obesity, tobacco use disorder, and alcohol abuse/alcohol dependence syndrome.

^**P < 0·01, * P < 0·05.