Table 1. Characteristics of study participants.

Total number of patients	12,298
Total average incidence rate, n/100,000 person-years	99.7
Age, mean (SD)	39.0 (12.9)
Year of surgery, n (%)     2015     2016     2017     2018	3,337 (27.1) 3,267 (26.6) 2,832 (23.0) 2,862 (23.3)
Average incidence rates, n/100,000 person-years     2015     2016     2017     2018	98.1 98.5 104.7 98.2
Indications, n (%)     Phimosis     Routine/Ritual     Phimosis + Balanitis/Balanoposthitis     Balanitis     Balanoposthitis     Other	6,453 (52.5) 3,523 (28.7) 839 (6.8) 463 (3.8) 321 (2.6) 699 (5.7)
Geographic region, n (%); Age-standardized incidence rates, (n/100,000 person-years)     Northeast     North Central     South     West     Unknown	2,513 (20.4); 125.1 1,730 (14.1); 110.1 6,052 (49.2); 101.0 1,944 (15.8); 61.0 59 (0.5); N/A
Type of service, n (%)     Inpatient     Outpatient	272 (2.2) 12,026 (97.8)
Type of insurance plan, n (%)     Comprehensive     EPO     HMO     POS     PPO     POS with capitation     CDHP     HDHP     Unknown	246 (2.0) 106 (0.9) 1,389 (11.3) 941 (7.7) 6,653 (54.1) 237 (1.9) 1,330 (10.8) 1,079 (8.8) 317 (2.6)

CDHP, consumer driven health plan; EPO, exclusive provider organization; HDHP, high deductible health plan; HMO, health maintenance organization; POS, point of service; PPO, preferred provider organization; SD, standard deviation.