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Table 2 Estimated fraction progressing from chlamydia infection to PID, using baseline values

From: Timing of progression from Chlamydia trachomatisinfection to pelvic inflammatory disease: a mathematical modelling study

Progression to PID Fraction progressing, % (95% CI)* Cumulative incidence of PID after one year, % (95% CI) Akaike’s Information Criterion
Control group Intervention group
Data     
Results from RCT   1.9 (1.2 to 2.9) 1.3 (0.7 to 2.1)  
Model     
Immediate progression 8.3 (5.7 to 11.0) 1.6 (1.1 to 2.1) 1.6 (1.1 to 2.1) 13.3
Constant progression 9.9 (6.8 to 13.0) 1.7 (1.2 to 2.3) 1.5 (1.0 to 1.9) 12.1
Progression at the end 10.0 (6.8 to 13.1) 1.7 (1.2 to 2.3) 1.5 (1.0 to 1.9) 12.1
  1. *The 95% CI is obtained by using the corresponding standard error and assuming a normal distribution.
  2. Cumulative incidence of PID after one year caused by chlamydia and other microorganisms together.
  3. Akaike’s information criterion values describe fit of model.
  4. PID, pelvic inflammatory disease; RCT, randomised controlled trial; CI, confidence interval.