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Table 6 Detailed results from QUADAS-2 risk of bias assessment

From: Recognition of out-of-hospital cardiac arrest during emergency calls — a systematic review of observational studies

Author, year of publication RISK OF BIAS
PATIENT SELECTION INDEX TEST REFERENCE STANDARD FLOW AND TIMING
[26] ✓ ✓ ✓ ✘
[7] ✘ ✓ ✓ ✓
[23] ✘ ✓ ✓ ✘
[27] ✘ ✓ ✓ ✘
[22] ✓ ✘ ✓ ✓
[19] ✓ ✓ ✓ ✓
[21] ✘ ✓ ✓ ✓
[21] ✘ ✓ ✓ ✓
[29] ✘ ✘ ✓ ✓
[30] ✘ ✘ ✓ ✓
[6] ✘ ✓ ? ✘
[14] ✘ ? ? ✓
[25] ✘ ✘ ✓ ✓
[15] ✘ ✓ ✓ ✓
[28] ✘ ✓ ✓ ✓
[24] ✘ ✓ ✓ ✓
  1. ✓ = Low Risk ✘ = High Risk ? = Unclear Risk
  2. NO: Norway, US: United States of America
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