| | Author | Year | Place | Clinical condition | n | % (CI 95) intubation failure |
| | Heschl et al. [16] | 2018 | Victoria, Australia | Trauma | 87 | 1, 2 (0.03–6.24) | | Tweed et al. [23] | 2018 | Texas, USA | Trauma, seizures, cardiac arrest, consciousness alterations, suffocation | 27 | 51.8 (31.1–72.5) | | Schmidt et al. [37] | 2016 | Zurich, Switzerland | Trauma, other medical conditions | 215 | 1.9 (0.5–4.7) | | Demaret et al. [19] | 2016 | Belgium | Trauma, cardiac arrest, others | 353 | 7.7 (4.7–10.6) | | Tarpgaard et al. [29] | 2015 | Central Denmark | Trauma, cardiac arrest, others | 25 | 4.0 (0.1–20.3) | | Hansen et al. [25] | 2015 | 40 states, USA | Trauma, cardiac arrest, seizure | 3124 | 19.0 (17.6–20.4) | | Carlson et al. [38] | 2015 | 33 states, USA | Trauma, breathing difficulty, cardiac arrest | 3599 | 23.8 (22.4–25.2) | | Bankole et al. [22] | 2011 | New Jersey, USA | Trauma | 39 | 20.5 (6.6–34.5) | | Hawkes [20] | 2009 | Denver, Colorado USA | Trauma, other medical conditions | 23 | 39.1 (17.0–61.2) | | Eich et al. [39] | 2009 | Göttingen, Germany | Trauma, seizures, SIDS, sepsis, toxicity, anaphylaxis, and others | 58 | 1.7 (0.0–9.2) | | Garza et al. [26] | 2005 | USA | Cardiac arrest | 86 | 44.2 (33.1–55.3) | | Ehrlich et al. [11] | 2004 | Virginia, USA | Trauma | 59 | 16.9 (6.5–27.4) | | Harrison et al. [40] | 2004 | Boston, USA | ND | 143 | 4.9 (1.0–8.8) | | Vilke et al. [41] | 2002 | San Diego, USA | Trauma, cardiorespiratory arrest, others | 324 | 18.5 (14.1–22.9) | | Cooper et al. [18] | 2001 | USA | Trauma | 479 | 0.4 (0.1–1.5) | | Boswell et al. [21] | 1995 | Georgia, USA | Trauma | 38 | 52.6 (35.4–69.8) | | Lavery et al. [42] | 1992 | New Jersey, USA | Trauma | 30 | 20.0 (7.7–38.6) | | Pointer [43] | 1989 | Alameda, USA | Trauma, drug overdose, others | 36 | 11.1 (3.1–26.1) | | Aijian et al. [44] | 1989 | California, USA | Cardiorespiratory arrest | 28 | 35.7 (16.2–55.2) |
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