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Table 2 Agreement on potential sick leave reduction by modifications to working conditions.

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

Observer agreement Number of sick leave forms Pairs of assessmentsa Bias index (BI) Observed agreement (Po) Kappa Proportional agreement yes (Ppos) Proportional agreement no (Pneg)
Within officers        
Sickness Certificate 1 999 985 0.05 0.40 (0.37, 0.43) 0.06 (0.02, 0.09) 0.37 (0.33, 0.41) 0.51 (0.47, 0.54)
Sickness Certificate 2 343 337 0.04 0.49 (0.44, 0.55) 0.19 (0.10, 0.27) 0.45 (0.38, 0.51) 0.63 (0.57, 0.68)
Within consultants        
Sickness Certificate 1 999 983 0.39 0.41 (0.38, 0.44) 0.05 (0.00, 0.10) 0.16 (0.13, 0.20) 0.54 (0.52, 0.57)
Sickness Certificate 2 343 340 0.32 0.49 (0.43, 0.54) 0.17 (0.08, 0.25) 0.42 (0.35, 0.49) 0.61 (0.56, 0.66)
Between officers and consultants        
Sickness Certificate 1 - historical sick leaves 501 2947 0.16 0.42 (0.40, 0.44) 0.08 (0.05, 0.11) 0.31 (0.29, 0.33) 0.54 (0.52, 0.56)
Sickness Certificate 1 + historical sick leaves 498 2953 0.16 0.42 (0.40, 0.43) 0.07 (0.04, 0.09) 0.29 (0.26, 0.31) 0.55 (0.53, 0.56)
Sickness Certificate 2 343 2031 0.10 0.48 (0.46, 0.51) 0.15 (0.12, 0.19) 0.43 (0.40, 0.45) 0.61 (0.59, 0.63)
  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, within and between National Insurance officers and consultants, regarding different levels of information. 95% confidence intervals (CIs) are given in brackets.