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Table 2 AUDIT-C threshold for drinking above weekly limits (female)

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 99.95 (99.70, 100.0) 3.95 (1.60, 7.98) 1.04 (0.50, 2.15) 0.01 (0.00, 0.07) 103.90 91.67 (90.39, 92.83)
≥3 99.95 (99.70, 100.0) 5.65 (2.74, 10.14) 1.06 (0.58, 1.94) 0.01 (0.00, 0.07) 105.60 91.82 (90.55, 92.97)
≥4* 99.63 (99.23, 99.85) 16.38 (11.26, 22.68) 1.19 (0.85, 1.66) 0.02 (0.01, 0.04) 116.01 92.45 (91.22, 93.56)
≥5 97.92 (97.17, 98.52) 33.90 (26.97, 41.38) 1.48 (1.20, 1.82) 0.06 (0.04, 0.08) 131.82 92.40 (91.17, 93.51)
≥6 92.06 (90.74, 93.24) 50.85 (43.24, 58.43) 1.87 (1.62, 2.16) 0.16 (0.13, 0.20) 142.91 88.50 (87.05, 89.85)
≥7 81.88 (80.06, 83.60) 68.93 (61.55, 75.66) 2.63 (2.38, 2.91) 0.26 (0.20, 0.33) 150.81 80.76 (78.99, 82.44)
≥8** 69.78 (67.64, 71.85) 81.92 (75.45, 87.29) 3.86 (3.58, 4.16) 0.37 (0.27, 0.51) 151.70 70.82 (68.80, 72.78)
≥9 48.61 (46.33, 50.90) 91.53 (86.41, 95.18) 5.74 (5.38, 6.12) 0.56 (0.34, 0.91) 140.14 52.31 (50.13, 54.49)
≥10 28.14 (26.12, 30.24) 97.18 (93.53, 99.08) 9.96 (9.23, 10.75) 0.74 (0.31, 1.76) 125.32 34.10 (32.05, 36.19)
  1. Drinking >14 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