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Table 4 Reproducibility of assessed sick leave reduction.

From: Reliability of sickness certificates in detecting potential sick leave reduction by modifying working conditions: a clinical epidemiology study

  Number of sick leave forms Pairs of assessmentsa Bias Index (BI) Observed agreement (Po) Kappa Proportional agreement yes (Ppos) Proportional agreement no (Pneg)
Intra-observer agreement        
Sickness Certificate 1 20 40 0.28 0.53 (0.36, 0.68) 0.23 (-0.03, 0.48) 0.29 (0.11, 0.52) 0.71 (0.56, 0.84)
Sickness Certificate 2 20 40 0.05 0.75 (0.59, 0.87) 0.52 (0.26, 0.78) 0.77 (0.56, 0.91) 0.82 (0.67, 0.91)
Inter-observer agreement between        
Ten consultants        
Sickness Certificate 1 20 860 0.08 0.43 (0.40, 0.47) 0.12 (0.07, 0.17) 0.48 (0.44, 0.52) 0.46 (0.43, 0.50)
Seven consultants        
Sickness Certificate 2 20 402 0.15 0.48 (0.43, 0.53) 0.07 (-0.02, 0.16) 0.59 (0.55, 0.64) 0.39 (0.33, 0.45)
Nine consultants        
Sickness Certificate 2 and sick-listeds' self-assessment 20 491 0.06 0.54 (0.50, 0.59) 0.20 (0.12, 0.28) 0.60 (0.56, 0.65) 0.55 (0.50, 0.60)
  1. a Missing assessments produce inconsistencies between the number of sick-listed subjects and the number of pairs of assessments. Reproducibility of the assessments of National Insurance consultants on whether work adjustments might reduce the ongoing sick leave in the categories of yes, uncertain, and no, presented as intra- and inter-observer agreement for different levels of information. 95% CIs are given in brackets.