Table 2

 Comparison of errors and other factors

Error or factorUnscheduled returns(n = 250)Non-returns(n = 250)p value
*Percentage: comparisons using Pearson or Fisher’s χ2 exact test.
†Median (P5–P95): comparisons using Mann-Whitney U rank exact test.
‡Only items reaching statistical significance are shown.
¶Linear trend.
Prognostic error*48140.000
Treatment error*3060.000
Follow up care error*2680.000
Diagnostic error*2040.000
Information error (points)†5 (4.8–5.2)6 (5.8–6.2)0.000
Diagnosis (erroneous or not) on 1st visit‡
    Hand wound*0.02.00.025
    Conjunctivitis*0.45.20.001
Reason for 1st visit‡
    Increasing degree of seriousness†7 (1–12)6 (0–11)0.043
    Dermatological*0.85.20.004
    Abdominal pain*12.40.00.000
    Dyspnea*12.05.60.012
Previous medical history‡
    Toxic habits*5.92.00.044
    Cardiopathy*8.14.40.029
Care zone*
    Resuscitation ward0.80.4
    Boxes63.261.2
    Triage36.038.40.738
Age (years)†48 (18–86)41 (18–82)0.008
Physician category*
    Emergency specialists11.611.6
    Emergency staff57.663.2
    Residents30.825.20.359
Observation ward admission*8.821.60.000
Treatment applied*66.456.00.017
Complementary studies*
    CT scanning1.62.40.523
    Ultrasound1.21.21.000
    Radiography42.438.80.412
    ECG20.014.00.074
    Blood test51.234.80.000
    Urine test22.012.40.004
Accessibility (min)
    Ordinal scale†4 (1–5)3 (1–5)0.001
    >80*22.629.2
    61–80*6.910.8
    41–60*4.410.4
    21–40*35.528.8
    <20*30.620.80.003; 0.002¶
Time band (work shift)*
    Night21.623.2
    Morning37.641.2
    Afternoon40.835.60.487
Day of the week*
    Sunday10.49.6
    Monday12.813.2
    Tuesday16.416.4
    Wednesday16.816.8
    Thursday10.410.8
    Friday13.216.4
    Saturday20.016.80.947
Clinical history*89.891.10.840
Nurse report*78.472.00.098
Sex (M/F)*70.0/82.530.0/17.50.189
Educational level*
    University2.67.8
    Secondary24.638.1
    Primary47.439.4
    Unschooled25.414.70.000; 0.000¶
Socioeconomic level*
    High2.27.1
    Medium26.844.7
    Low71.048.20.000; 0.000¶