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Table 1 Characteristics of studies and patients enrolled from studies retrieved for meta-analysis

From: Lung ultrasound for the diagnosis of pneumonia in adults: a systematic review and meta-analysis

Study Year Origin Design Sample size Mean age (years) M/F True positive False positive False negative True negative
Benci et al.[31] 1996 Italy Prospective 57 38.5 50/30 37 0 0 20
Lichtenstein et al.[32] 2004 France Prospective 32** 58 Not mentioned 111 0 8 265
Lichtenstein et al.[33] 2004 France Prospective 117 53 37/23 59 1 6 51
Lichtenstein et al.[34] 2008 France Prospective 260 68 140/120 74 10 9 167
Parlamento et al.[35] 2009 Italy Prospective 49 60.9 31/18 31 0 1 17
Cortellaro et al.[21] 2010 Italy Prospective 120 69 77/43 80 2 1 37
Xirouchaki et al.[38] 2011 Greece Prospective 42* 57.1 34/8 66 4 0 14
Reissig et al.[22] 2012 Europe Prospective 356 63.8 228/134 211 3 15 127
Testa et al.[36] 2012 Italy Prospective 67 55 Not mentioned 32 5 2 28
Unluer et al[37] 2013 China Prospective 72 66.3 35/37 27 7 1 37
  1. **Unit of analysis was 12 lung regions. *Unit of analysis was each hemithorax.