Additional file 2.

variables and proxies used for validation of clinical prediction rules. N = Number of children in dataset; % n/N = Percentage of cases (n) out of all children (N) used for the external validation analysis; green font indicate original variable, red font,variable not recorded, blue font, proxy variable. aDerivation study (italic). b'Clinical sick impression' used as proxy for 'physician's gut feeling that something is wrong', c'Respiratory distress' used as proxy for 'dyspnoea'. d'Chest flaring' used as proxy for 'dyspnoea'. e'Meningeal irritation' used as proxy for 'nuchal rigidity'. f'Unconsciousness' used as proxy for 'coma'.

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Verbakel et al. BMC Medicine 2013 11:10   doi:10.1186/1741-7015-11-10