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Table 3 AUDIT-C threshold for drinking above weekly limits (male)

From: Validation of the AUDIT-C in adults seeking help with their drinking online

AUDIT-C score Sensitivity  % (95% CI) Specificity  % (95% CI) LR+a (95% CI) LR−b (95% CI) Sensitivity + specificity % Correctly classified (95% CI)
≥2 99.93 (99.62, 100.0) 2.81 (0.92, 6.43) 1.03 (0.43, 2.44) 0.02 (0.00, 0.14) 102.74 89.35 (87.75, 90.81)
≥3 99.86 (99.50, 99.98) 7.30 (3.95, 12.17) 1.08 (0.64, 1.82) 0.02 (0.01, 0.08) 107.16 89.78 (88.21, 91.21)
≥4 99.66 (99.20, 99.89) 11.80 (7.45, 17.47) 1.13 (0.76, 1.69) 0.03 (0.01, 0.07) 111.46 90.09 (88.53, 91.49)
≥5* 99.18 (98.56, 99.57) 25.28 (19.08, 32.33) 1.33 (1.03, 1.71) 0.03 (0.02, 0.05) 124.46 91.13 (89.64, 92.46)
≥6 96.09 (94.96, 97.02) 40.45 (33.17, 48.05) 1.61 (1.35, 1.92) 0.10 (0.08, 0.13) 136.54 90.02 (88.47, 91.44)
≥7 90.25 (88.61, 91.72) 53.93 (46.32, 61.42) 1.96 (1.71, 2.25) 0.18 (0.14, 0.22) 144.18 86.29 (84.53, 87.92)
≥8** 82.14 (80.08, 84.08) 66.29 (58.84, 73.19) 2.44 (2.19, 2.72) 0.27 (0.21, 0.34) 148.43 80.42 (78.41, 82.31)
≥9 63.19 (60.65, 65.67) 80.34 (73.73, 85.91) 3.21 (2.96, 3.49) 0.46 (0.34, 0.62) 143.53 65.06 (62.69, 67.37)
≥10 41.21 (38.67, 43.79) 88.20 (82.53, 92.55) 3.49 (3.22, 3.79) 0.67 (0.45, 1.00) 129.41 46.33 (43.89, 48.78)
  1. Drinking >21 units of alcohol in past week
  2. *The most accurate AUDIT-C cut-off score for identifying risky drinkers
  3. **The ‘optimal’ AUDIT-C cut-off score for identifying risky drinkers
  4. aLR+ positive likelihood ratio
  5. bLR− negative likelihood ratio