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Table 1 Characteristics of patients with pelvic inflammatory disease and comparison subjects

From: Risk of uterine, ovarian and breast cancer following pelvic inflammatory disease: a nationwide population-based retrospective cohort study

  PID (%) Control (%) P values
No. 32,268 32,268  
Age (years) a 34.48 (27.46 – 42.06) 34.48 (27.47 – 42.06) 0.972
Distribution of age    >0.999
 20 – 39 22,221 (68.86) 22,221 (68.86)  
 40 – 59 9299 (28.82) 9299 (28.82)  
  > 60 748 (2.32) 748 (2.32)  
Comorbidities    
 Hypertension 1985 (6.15) 1640 (5.08) <0.001b
 Diabetes mellitus 1452 (4.50) 1106 (3.43) < 0.001b
 Dyslipidemia 1816 (5.63) 1266 (3.92) < 0.001b
 Coronary artery disease 51 (0.16) 37 (0.11) 0.137
 Congestive heart failure 181 (0.56) 132 (0.41) 0.006b
 Cerebrovascular disease 437 (1.35) 348 (1.08) 0.002b
 Chronic pulmonary disease 1684 (5.22) 1230 (3.81) < 0.001b
Degree of urbanization    < 0.001b
 Urban 20,634 (63.95) 21,167 (65.60)  
 Suburban 8,998(27.89) 8,632 (26.75)  
 Rural 2,159 (6.69) 1,971 (6.11)  
Income group    < 0.001b
 Low income 13,021 (40.35) 13,978 (43.32)  
 Median income 15,719 (48.71) 13,016 (40.34)  
 High income 3,528 (10.93) 5,274 (16.34)  
Follow-up, years a 8.84 (8.04 – 9.51) 8.84 (8.04 – 9.51) >0.999
Newly diagnosed cancers, N (%)
 Ovarian cancer 34 (0.11) 24 (0.07) 0.192
 Breast cancer 228 (0.71) 222 (0.69) 0.777
 Uterine cancer 35 (0.11) 27 (0.08) 0.313
Age of diagnosis of cancer (years) a
 Ovarian cancer 45.50 (40.75 – 59.00) 46.50 (41.25 – 51.75) 0.183
 Breast cancer 46.00 (40.00 – 52.00) 45.00 (41.00 – 50.00) 0.397
 Uterine cancer 47.00 (40.00 – 56.00) 52.00 (45.00 – 55.00) 0.222
  1. PID pelvic inflammatory disease
  2. a Median (interquartile range)
  3. bStatistical significance