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Inter-observer variation in the assessment of clinical signs in sick Tanzanian children
E Kahigwa1, D Schellenberg, J Armstrong Schellenberg
1Ifakara Health Research and Development Centre, P.O. Box 53, Ifakara, Tanzania.
Insights
This study evaluated agreement among clinicians diagnosing childhood illnesses in Tanzania. While many Integrated Management of Childhood Illness signs showed good agreement, neurological signs and dehydration detection require further attention for accurate pediatric care.
Area of Science:
- Pediatrics
- Global Health
- Clinical Epidemiology
Background:
- Accurate clinical sign identification is crucial for diagnosing childhood illnesses.
- The Integrated Management of Childhood Illness (IMCI) strategy relies on specific clinical signs.
- Assessing inter-observer agreement is vital for standardizing diagnostic practices.
Purpose of the Study:
- To evaluate inter-observer agreement in identifying 24 clinical signs in children under 5 years old.
- To assess the appropriateness of signs within the IMCI algorithm.
- To identify challenges in diagnosing specific conditions in young children.
Main Methods:
- A study involving 327 children under 5 years old in Ifakara, Tanzania.
- Independent examination by two clinical officers using a standard proforma.
- Statistical analysis using the Kappa-statistic to measure inter-observer agreement for each sign.
Main Results:
- Higher agreement was observed for signs detected by inspection compared to auscultation.
- Most IMCI signs showed good agreement (Kappa > 0.41).
- Fair agreement was noted for neck stiffness and chest indrawing (Kappa 0.21-0.40), and slight agreement for dehydration (Kappa 0.199).
- Neurological signs were less reliably assessed in infants than older children.
Conclusions:
- The IMCI algorithm's signs are largely appropriate, but specific areas need improvement.
- Challenges in diagnosing dehydration and neurological impairments in young children necessitate increased clinical vigilance.
- Refining diagnostic criteria for neurological complications in infants is essential for improved outcomes.
Abstract:
We assessed the inter-observer agreement in identification of a range of 24 clinical signs associated with disease presentation in 327 children aged < 5 years admitted to hospital in January-June 1999 in Ifakara, southern Tanzania. Children with diagnoses of malaria, pneumonia, diarrhoea, anaemia and malnutrition were examined independently by 2 clinical officers. Findings were recorded on a standard proforma. The Kappa-statistic was used to assess inter-observer agreement for each sign. Physical signs were more likely to be agreed upon by clinicians if they involved inspection than if they involved auscultation. The signs included in the Integrated Management of Childhood Illness (IMCI) algorithm were found to be largely appropriate (Kappa-scores > 0.41) although there was only fair agreement (Kappa-score 0.21-0.40) in the detection of neck stiffness and chest indrawing and slight agreement in the detection of dehydration (Kappa-score 0.199). All objective neurological signs were less reliably assessed in infants than in older children. The difficulties surrounding the diagnosis of impaired consciousness in young children should increase vigilance in the diagnosis and management of neurological complications of illnesses in infancy.
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