ICD-9 codes utilised by included studies
| ICD-9-CM code and description | Included studies |
| 614.0—Acute salpingo-oophoritis | Satterwhite et al15 |
| 614.2—Salpingitis/oophoritis, not acute or chronic | Ratelle et al16, Satterwhite et al15 |
| 614.3—Acute parametritis/PID | Satterwhite et al15 |
| 614.5—Acute or unspecified pelvic peritonitis | |
| 614.8—Other specified inflammatory disease, female pelvic organs | |
| 614.9—Unspecified inflammatory disease, female pelvic organs | Ratelle et al16, Satterwhite et al15 (2011) |
| 615.0—Inflammatory disease of uterus, except cervix | Satterwhite et al15 |
| 615.9—Unspecified inflammatory disease of uterus | |
| 098.10—Acute gonococcal infection of upper genitourinary tract, site unspecified | |
| 098.16—Acute gonococcal endometritis | |
| 098.17—Acute gonococcal salpingitis | |
| 098.19—Acute gonococcal infection upper genitourinary tract, other site | |
| 098.86—Acute Gonococcal peritonitis | |
| 099.56—Other venereal diseases due to chlamydia trachomatis, peritoneum |
ICD-9-CM, International Classification of Diseases, Ninth Revision, Clinical Modification.