Kellog 1987.

Study characteristics
Patient sampling	Cross‐sectional study Prospective design Sample: unclear Direct comparison of different RADTs: no Direct comparison of several throat culture techniques: yes (office versus laboratory culture) Person performing the throat sample: not reported Exclusion if recent antibiotics use before inclusion: no Clinical selection of patients: none Presenting signs and symptoms: patients with symptoms of pharyngitis Age range for inclusion: not reported (only age range of included patients)
Patient characteristics and setting	Sample size: 358 Age (distribution): mean 7.2 years (range 7 months to 19 years) GAS prevalence according to culture (with 95% confidence interval): 29.9% (95% CI not reported) Country of study: USA Sex (% of girls): not reported Clinical severity assessment: none Clinical setting: office‐based Single‐centre study
Index tests	Throat swab: 1 single swab (used for culture and then for the RADT) Commercial name of the RADT: TestPack Strep A (Abbott) Type of RADT: EIA
Target condition and reference standard(s)	Throat culture medium: standard Atmosphere of incubation: anaerobic Duration of incubation: 48 hours GAS confirmation: latex test or direct fluorescent antibody procedure Number of plates inoculated: 1 Assessment of GAS antibody response: no Relevant details: 2 swabs were taken from each patient. Swab #1 was used in the office for culture (office culture) and then for performing the RADT. Swab #2 was sent to the laboratory for culture and then for performing the RADT. We only extracted data related to analyses performed in the microbiology laboratory.
Flow and timing	No follow‐up
Comparative
Type of study	Journal article
Notes	2 swabs were taken from each patient. Swab #1 was used in the office for culture (office culture) and then for performing the RADT. Swab #2 was sent to the laboratory for culture and then for performing the RADT. We only extracted data related to analyses performed in the microbiology laboratory.
Methodological quality
Item	Authors' judgement	Risk of bias	Applicability concerns
DOMAIN 1: Patient Selection
Was a consecutive or random sample of patients enrolled?	Unclear
Was it a cross‐sectional study or a RCT?	Yes
Were selection criteria clearly described (at least presenting signs and symptoms and age limits for inclusion)?	No
Was clinical selection of patients avoided?	Yes
Were patients seen in an ambulatory care setting?	Yes
		High	Low
DOMAIN 2: Index Test All tests
Were the RADT results interpreted with blinding of the results of culture?	Yes
Was the type of the RADT mentioned (EIA or OIA)?	Yes
Were RADTs conducted during consultation time?	No
		Low	High
DOMAIN 3: Reference Standard
Were culture results interpreted with blinding of the results of the RADT?	Unclear
Is the throat culture method likely to correctly identify GAS (laboratory culture on a blood agar plate during 48 hr)?	Yes
Were the culture medium, atmosphere, duration of incubation and GAS‐confirmation technique described?	Yes
		Unclear	Low
DOMAIN 4: Flow and Timing
Was the delay between the performance of the RADT and throat culture plating less than 48 hours?	Yes
Did all patients receive a throat culture?	Yes
Did patients receive the same throat culture method?	Yes
Were undetermined/uninterpretable results reported?	No
Were withdrawals from the study explained?	No
		Low