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Lancet. 1985 May 4; 1(8436):1046.As part of a study on acute febrile pelvic inflammatory disease and IUDs, reported elsewhere, a significantly lower risk of PID was observed in women using injectable contraceptives. The World Health Organization coordinated the multinational case-control study in 1979-79. Diagnostic criteria were fever, suprapubic tenderness with guarding, cervical or adnexal tenderness or a pelvic mass. 319 cases and 639 matched controls were matched for age, parity, marital status and hospital status. Data were taken from questionnaires. 10 cases (3.1%) currently used injectable contraceptives, mainly Depo-Provera, compared to 38 controls (6.0%). Thus the risk of getting PID was half as great among injectable users, similar in magnitude to risks reported for women using oral contraceptives, barrier methods and sterilization in developing countries.