1. Data extraction form.

[Study ID]	First author, year of publication
Type of study	Journal article, unpublished data
Participants	Sample size Country of study Baseline characteristics (gestational age, postnatal age, race/ethnicity, bodyweight)
Study design	Retrospective/prospective design Sample (consecutive, random, or unclear)
Study criteria	Inclusion criteria Exclusion criteria
Reference standard	Name of assay/manufacturer Name of instrument Cutoff values Time between reference standard performance and TcB measurement Blinding of operator to TcB result
Index test	Name of device Cutoff values Operator training Site of measurement (forehead, sternum)
Target condition	Universal screening of newborns for hyperbilirubinaemia Diagnostic determination of hyperbilirubinaemia in visibly jaundiced newborns
Data	Number of true positives and false positives Number of true negatives and false negatives Number of undetermined/uninterpretable results Sensitivity and specificity of index test Number of missing results for index test Number of missing results for reference standard
Notes	Source of funding (whether any author is affiliated with the manufacturer of the index test; the study was directly funded by the manufacturer; whether authors reported conflicts of interests related to the manufacturer or other funding sources)

TcB: transcutaneous bilirubin.