TABLE 2.

Description of prospective cohort studies of chlamydia

Year*	Location	Author (reference)	Study site	Study subjects	Eligibility criteria	Primary method of detection
1991	Sweden	Rahm et al (104)	One adolescent clinic	301 females	Sexually active adolescent attenders	Culture
1994	Netherlands	Prins et al (98)	STD clinic	234 females 155 males	Consecutive patients, heterosexual, reported ≥ 5 partners in the past six months, ≥ 18 years	Culture
1996	United States	Mosure et al (69)	160 family planning clinics	26,921 females	Sexually active patients having a pelvic examination who were tested for chlamydia on two or more occasions between 1988 and 1992, 15 to 19 years	DFA
	United States	Oh et al (99)	Adolescent clinics	216 females	Sexually active patients having pelvic examinations who had at least two visits with indications for repeat screening during the study period	Culture
1998	United States	Burstein (34)	Three middle school clinics	188 females	Consecutive patients	LCR
	United States	Burstein et al (82)	Family planning, STD and school-based clinics	3202 females	Consecutive patients, 12 to 19 years	PCR

^*Year of publication;

DFA Direct fluorescent antibody; LCR Ligase chain reaction; PCR Polymerase chain reaction; STD Sexually transmitted disease