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Completeness and Quality of Ibadan (Nigeria) Mortuary Dataset

Authors: Kavi Bhalla, Jerry P Abraham and Uwom Eze

Date: July 7, 2010

 

Objective: To do a crude test of the completeness and quality of the UCH-Ibadan mortuary dataset

Method: The number of deaths in the mortuary records was compared with an estimate of the number of deaths expected in the Ibadan metropolitan area

Findings:

-          The quality of cause of death attribution of the dataset is high with a relatively small number of deaths assigned to unspecified causes.

-          The completeness of the database is low (approximately 20%).

 

 

 

Background

-          Data Source Analyzed: Ibadan University College Hospital (UCH) Mortuary Records. The dataset contained records for three years, 2007, 2008, and 2009. Only data from the most recent year (2009) was used in this completeness test. 

-          Analysis in this report should be repeated once better data on urban mortality in Nigeria is available:

o   The analysis in this report uses crude estimates of population and mortality in Ibadan. Typically these have been extrapolated from estimates available for the country in international databases. Accurate data for population and mortality in urban Nigeria should be available from the Nigeria General Household Survey. This analysis should be updated when these estimates are available. (Note that the 2006 Census in Nigeria does not include any questions on household deaths)

-          This mortuary database only contains injury cases. Note that the database was retrospectively constructed from the mortuary records. During this process, only causes for injury cases were determined and the remaining were coded as “Not Injury”.  In 2009, 40% of the mortuary records were for injury cases. This is a very high fraction suggesting that the mortuary is more likely to receive injury cases.  

 

 

 

 


 

Table 1: External cause distribution of deaths in the UCH-Ibadan Mortuary Dataset

External Cause

Deaths

% of total

Road Traffic Accident - PEDESTRIAN

79

20%

Road Traffic Accident - MOTORCYCLE / MOTORIZED TWO WHEELER

106

27%

Road Traffic Accident - CAR or VAN OCCUPANT

44

11%

Road Traffic Accident - BUS OCCUPANT

19

5%

Road Traffic Accident - TRUCK OCCUPANT

5

1%

Road Traffic Accident - UNKNOWN RTA

19

5%

Falls

26

7%

Other Threats to Breathing (eg. hanging, suffocation, strangulation, choking, asphyxia, etc)

1

0%

Fire (flames, scaldes, burns, etc)

67

17%

Beating

4

1%

Firearm (gunshots)

15

4%

Sharp Object (stabbing, knife, etc)

1

0%

Poisoning - OTHER POISON

1

0%

Complications of Medical Care/Adverse Effects

1

0%

Animal Contact (scorpion, snakebite, dog attack, etc)

1

0%

Legal Intervention (police execution, etc)

1

0%

OTHER Type of Injury

6

2%

UNKNOWN INJURY

4

1%

Grand Total

400

100%

 

Assessment of Quality of Injury Coding

·         The quality of cause of death attribution in the dataset is high with relatively few cases assigned to partially-specified cause categories.

o   7% of the road traffic deaths were not further specified.

o   1% of all injury cases were not further specified 

Assessment of Completeness

·         Coverage: The UCH mortuary receives cases from across Oyo state and from Southwest Nigeria but the majority of the cases are from Ibadan. However, in this analysis it is assumed that the mortuary receives cases only from Ibadan. Thus, the injury deaths in the UCH-mortuary are compared with total estimated injury deaths in the city.  

·         Age aggregation: The assessment focuses on deaths among young adults aged between 15-59 years in Ibadan. This was done to reduce uncertainty in this analysis. (Injuries occur primarily among young adults and the high mortality among children and older adults can add substantial uncertainty to analysis)


 

TABLE 2: Assessment of completeness of the UCH-Ibadan mortuary dataset (Year 2009)

POPULATION CALCULATION

 2,628,000

both sexes

Population of Ibadan Urban Area in 2007

1,314,000

Male

 

 1,314,000

Female

 

 

Source: World Urbanization Prospects for total population + assuming 50-50 gender distribution

% that are between 15-59 years

55.02%

Male

% of urban males, 15-19 years in Nigeria

51.81%

Female

% of urban females, 15-19 years in Nigeria

 

Source: UNPD World Population Prospects 2008 (all urban population)

Population of Ibadan between 15-59 years

 723,020

Male

 

 680,811

Female

 

 

Calculated from above

DEATHS CALCULATION

Death rate for 15-59 years in Ibadan

0.00752

Male

(per person)

0.00653

Female

 

 

Source: Estimated from UNPD all-cause deaths and UNPD population for year 2000

Estimated all-cause deaths among 15-59 years in Ibadan

5440

Male

 

4448

Female

 

 

Source:  Death rate applied to Ibadan Population

Fraction of all-cause deaths that are due to injuries among people aged 15-59 years

19.7%

Male

 

5.2%

Female

 

 

Source: GBD-2004, Africa region

Estimates of injury deaths in age group 15-59 years in Ibadan

 1,074

Male

 

 230

Female

 

 

Calculated from above

COMPLETENESS TEST

Mortuary Injury Deaths between the ages of 15-59 years

214

Male

 

54

Female

 

 

Source: Mortuary data for six months - scaled to one-year

Completeness of injury deaths between ages 15-59 years

20%

Male

fraction of estimated injury deaths that were seen at the mortuary

23%

Female

 

21%

Total

 

 

Calculated from above

 

This comparison suggests that the completeness of the mortuary dataset is low. We estimate that only approximately one-fifth of the injury deaths in Ibadan are in the UCH-Ibadan mortuary records.
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