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Table 3 Physicians' ability (c = 58) to correctly guess the diagnosis for different patients' factors (n = 626).

From: Predictive ability of an early diagnostic guess in patients presenting with chest pain; a longitudinal descriptive study

 

Mean physicians' predictive ability

Odds Ratio adjusted for cluster effects

Differences between GP

 

% (SD)

ORCE (95% CI)

p-value

ρ*

Patients' age

    

   <50 yrs (n = 257)

   56.4% (1.8%)

   1.4 (0.98 to 2.0)

p = 0.066

ρ = 0.096

   ≥50 yrs (n = 369)

   50.4% (1.3%)

   -

 

-

Patients' gender

    

   Men (n = 304)

   50.7% (1.5%)

   0.93 (0.67 to 1.3)

p = 0.680

ρ = 0.089

   Women (n = 322)

   55.0% (1.5%)

   -

 

-

Known patient

    

   Yes (n = 569)

   53.1% (0.9%)

   1.3 (0.72 to 2.4)

p = 0.386

ρ = 0.088

   No (n = 57)

   47.4% (4.9%)

   -

 

-

New Complaint

    

   Yes (n = 301)

   48.5% (1.5%)

   0.78 (0.56 to 1.1)

p = 0.158

ρ = 0.088

   No (n = 325)

   54.2% (1.2%)

   -

 

-

Patient feeling anxious

    

   Yes (n = 348)

   44.8% (1.3%)

   0.46 (0.33 to 0.65)

p < 0.0001

ρ = 0.090

   No (n = 278)

   62.9% (1.5%)

   -

 

-

Life threatening

    

   Yes (n = 104)

   65.4% (3.5%)

   1.8 (1.1 to 2.8)

p = 0.015

ρ = 0.087

   No (n = 522)

   50.3% (0.1%)

   -

 

-

  1. * ρ is the intraclass correlation coefficient (ICC) which corresponds to the proportion of the total observed variance which is related to the lack of independence between measures taken from the same physician. A value of 0 indicates no differences between physicians whereas a value of 1 indicates that the associations are totally dependent on physicians.