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Table 3 Agreement between sick-listed subjects and National Insurance assessors.

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

Observed agreement between sick-listed and Number of sick-listed Pairs of assessmentsa Bias index (BI) Observed agreement (Po) Kappa Proportional agreement yes (Ppos) Proportional agreement no (Pneg)
-Officers        
Sickness Certificate 1 159 317 0.09 0.38 (0.33, 0.43) 0.05 (-0.03, 0.13) 0.34 (0.27, 0.41) 0.49 (0.43, 0.55)
Sickness Certificate 2 60 120 0.08 0.33 (0.24, 0.42) -0.05 (-0.18, 0.08) 0.23 (0.15, 0.33) 0.44 (0.33, 0.54)
-Medical consultants        
Sickness Certificate 1 159 316 0.01 0.39 (0.33, 0.44) -0.01 (-0.10, 0.08) 0.28 (0.21, 0.35) 0.52 (0.47, 0.58)
Sickness Certificate 2 60 119 0.05 0.36 (0.28, 0.45) -0.05 (-0.19, 0.09) 0.23 (0.14, 0.34) 0.48 (0.39, 0.57)
-Extended group of medical consultants        
Ten consultants        
Sickness Certificate 1 20 200 0.05 0.31 (0.24, 0.37) -0.12 (-0.22, 0.02) 0.30 (0.23, 0.38) 0.39 (0.32, 0.46)
Seven consultants        
Sickness Certificate 2 20 137 0.17 0.31 (0.23, 0.39) -0.18 (-0.31, -0.04) 0.35 (0.27, 0.44) 0.32 (0.24, 0.41)
  1. a Missing assessments produce inconsistencies between the number of sick-listed subjects and the number of pairs of assessments. Observer agreement on whether work adjustments might reduce the ongoing sick leave assessed in the categories of yes, uncertain, and no, between sick-listed subjects and National Insurance officers and consultants. 95% CIs are given in brackets.