Table 3 Predictive validity – identifying sick leaves lasting at least 12 weeks. Predictive validity of identifying sick leaves that lasted at least 12 weeks, using 8 weeks as the cut-off in length as predicted by the sick-listed, medical consultants and officers. The prediction based on the Sickness Certificate 2 (SC2) used a cut-off in predicted length of at least 12 weeks. Sensitivity, specificity, PPV, and likelihood ratio data for NIO assessors are presented as means with 95% CI.
Predicted length | n assessments | Sensitivity (95% CI) | Specificity (95% CI) | Likelihood ratio (95% CI) | PPV1 (95% CI) | PPV adjusted to prevalence 33.4% (95% CI) |
|---|---|---|---|---|---|---|
Sick-listed | 152 | 0.69 (0.56–0.84) | 0.80 (0.70–0.87) | 3.4 (1.9–6.2) | 0.68 (0.54–0.79) | 0.63 (0.49–0.76) |
Medical consultants Responder group | 301 | 0.35 (0.26–0.44) | 0.78 (0.71–0.84) | 1.6 (1.0–2.5) | 0.49 (0.38–0.61) | 0.44 (0.33–0.56) |
Medical consultants All participants | 1961 | 0.42 (0.38–0.45) | 0.75 (0.73–0.77) | 1.7 (1.4–1.9) | 0.45 (0.41–0.49) | |
Officers Responder group | 302 | 0.53 (0.44–0.62) | 0.59 (0.51–0.66) | 1.3 (0.9–1.8) | 0.44 (0.36–0.53) | 0.39 (0.31–0.48) |
Officers All participants | 1968 | 0.53 (0.49–0.57) | 0.60 (0.58–0.63) | 1.3 (1.2–1.5) | 0.40 (0.37–0.43) | |
Medical consultants SC2 | 637 | 0.85 (0.82–0.88) | 0.44 (0.36–0.52) | 1.5 (1.2–1.9) | 0.82 (0.79–0.86) | 0.43 (0.39–0.48) |
Officers SC2 | 636 | 0.88 (0.86–0.91) | 0.33 (0.26–0.41) | 1.3 (1.1–1.7) | 0.80 (0.77–0.84) | 0.40 (0.35–0.44) |