Table 1: Characteristics of studies included in analysis ( ).

CharacteristicsStudies %

Study type
 Descriptive6591.5
 Analytic22.8
 Interventional45.6
Study scope
 Laboratory-based 1 1.4
 Population-based1521.1
 Hospital-based5577.5
Influenza diagnostic methods
 Clinical diagnosis3245.1
 Antigen/antibody detection1622.5
 RT-PCR 1 1.4
  Culture2231.0
Bacterial infection diagnostic methods
  Clinical diagnosis 3 4.2
 Antigen/antibody detection 2 2.8
 Culture6693.0

Note: RT-PCR, reverse transcription-polymerase chain reaction.