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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.