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3. The Burden of Disease and Mortality by Condition: Data, Methods, and Results for 2001

Table 3.11: Numbers of Country Data Sources Contributing to the Estimation of YLD, by Region and Cause

Numbers of Country Data Sources Contributing to the Estimation of YLD, by Region and Cause
GBD cause category	East Asia and Pacific	Europe and Central Asia	Latin America and the Caribbean	Middle East and North Africa	South Asia	Sub-Saharan Africa	High-income countries	Total ^a
I. Communicable, maternal, perinatal, and nutritional conditions
Tuberculosis^b	24	27	34	16	8	39	31	179
Sexually transmitted diseases excluding HIV/AIDS^c	143	318	148	45	99	406	297	1,456
HIV/AIDS^b	14	26	27	13	5	37	29	150
Diarrheal diseases	155	0	27	55	29	91	0	357
Childhood-cluster diseases^d
Pertussis	14	33	64	14	8	45	124	302
Poliomyelitis	22	27	32	15	8	47	37	192
Diphtheria	12	25	2	14	8	46	8	115
Measles	22	18	32	12	8	47	22	127
Tetanus	48	23	27	40	32	79	34	289
Meningitis	23	18	30	12	4	27	43	157
Hepatitis B	4	4	6	6	10	11	28	69
Hepatitis C^e	36	23	41	37	8	56	85	286
Malaria	9	0	2	1	7	98	0	117
Tropical-cluster diseases
Trypanosomiasis^b	0	0	0	0	0	36	0	36
Chagas' disease	0	0	31	0	0	0	0	31
Schistosomiasis	6	0	3	8	0	37	1	55
Leishmaniasis^f	3	7	15	13	4	20	4	66
Lymphatic filariasis^b	29	0	8	5	5	40	2	89
Onchocerciasis	0	0	6	0	0	26	0	32
Leprosy^b	32	10	8	14	8	45	3	120
Dengue^g	91	0	170	0	4	2	15	282
Japanese encephalitis^b	10	1	0	0	3	0	4	18
Trachoma	11	0	4	5	4	19	0	43
Intestinal nematode infections	29	0	23	13	10	53	6	134
Lower respiratory infections	15	0	15	12	30	18	5	95
Otitis media	4	0	0	2	2	7	9	24
Maternal conditions
Maternal hemorrhage	3	0	2	0	1	13	9	28
Maternal sepsis	2	0	3	0	1	14	11	31
Hypertensive disorders of pregnancy	1	0	1	0	2	12	2	18
Obstructed labor	2	0	2	0	1	14	2	21
Abortion	32	10	11	13	49	156	27	32
Perinatal conditions
Low birthweight^h	28	27	33	15	7	41	33	184
Birth asphyxia and birth trauma	7	0	7	11	19	12	0	56
Nutritional deficiencies
Protein-energy malnutritionⁱ	61	28	116	37	30	132	15	419
Iodine deficiency	17	13	13	17	12	44	20	136
Vitamin A deficiency	10	2	12	4	4	29	8	67
Iron-deficiency anemia	14	1	1	15	5	33	0	69
II. Noncommunicable diseases
Malignant neoplasms
Incidence	11	8	11	10	2	14	25	81
Survival	3	4	1	0	1	0	15	24
Diabetes mellitus - type 1^j	22	12	17	5	1	2	41	100
Diabetes mellitus - type 2	6	4	5	8	3	6	8	40
Neuropsychiatric conditions
Unipolar depressive disorders	5	5	6	3	4	6	27	56
Bipolar affective disorder	2	1	1	1	2	0	14	21
Schizophrenia	4	3	3	1	3	6	25	45
Epilepsy^k	1	1	6	1	4	8	7	28
Alcohol use disorders	24	43	39	13	5	34	56	214
Alzheimer's and other dementias	10	3	3	0	4	3	87	110
Parkinson's disease^k	2	1	1	0	1	1	7	13
Multiple sclerosis	4	24	3	5	1	1	116	154
Drug use disorders	11	11	18	10	6	15	43	114
Post-traumatic stress disorder	1	0	1	0	0	0	6	6
Obsessive-compulsive disorder	2	0	3	0	1	0	14	20
Panic disorder	2	0	3	1	0	2	22	30
Insomnia (primary)	2	2	5	1	1	1	9	21
Migraine	6	2	5	2	0	1	11	43
Mental retardation attributable to lead exposure	10	12	21	4	14	9	23	93
Sense organ diseases
Vision disorders^b	11	3	4	5	4	19	9	55
Hearing loss, adult onset	5	0	1	1	5	1	12	25
Cardiovascular diseases	0	0	0	0	0	0	0	0
Rheumatic heart disease	15	0	12	9	15	26	7	84
Ischemic heart disease	3	11	0	2	4	1	58	79
Cerebrovascular disease	4	8	1	5	0	6	28	52
Other cardiovascular diseases	0	0	0	0	0	0	5	5
Respiratory diseases
Chronic obstructive pulmonary disease	24	10	10	4	16	8	32	104
Asthma	17	14	20	12	6	7	74	149
Musculoskeletal diseases
Rheumatoid arthritis	4	1	4	4	2	5	9	29
Osteoarthritis	1	1	1	0	2	1	9	15
Congenital malformations	3	42	29	6	9	6	5	100
Oral conditions^f	22	24	32	15	7	35	27	162
III. Injuries	3	1	1	0	0	6	7	18
Total ^l	1,155	914	1,239	590	522	1,955	1,735	8,096

Source: Authors' compilation.

Note: The data sources include population-based epidemiological studies, disease registers, and surveillance and notification systems, but exclude death registration data (see tables 3.1 and 3.2 ). Where possible, regional and global totals refer to numbers of separate studies, or country-years of reported data from surveillance or notification systems. For some causes, regional subtotals for the Disease Control Priorities Project regions were estimated from subtotals for WHO regions and subregions. See text for more information on data sources for specific causes.

a. Global totals may include global review studies not counted in regional subtotals.

b. Totals refer to numbers of countries for which data were available, not to total data sets or country-years.

c. Regional subtotals were estimated from the current distribution of studies in the WHO sexually transmitted infection (STI) surveillance database.

d. Regional subtotals were estimated from numbers of studies by WHO region, rather than by re-accessing original databases.

e. Country-years of data available for 133 countries.

f. Approximate estimate from current WHO database; original extraction from surveillance data sources is not available.

g. Country-years of surveillance reports (approximate, minimum estimate for Latin America and the Caribbean).

h. Estimate based on final published literature review.

i. Regional distribution of the 419 national studies used is assumed to be similar to that of the current 442 national studies in the WHO malnutrition database.

j. Total of 100 population-based registries in 50 countries.

k. Approximate minimum estimate. Several global reviews were used; studies were not separately counted.

l. Actual numbers of studies used exceed the minimums shown here, based on summed table entries for specific causes regardless of whether counts were of data sets or of countries.

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3. The Burden of Disease and Mortality by Condition: Data, Methods, and Results for 2001

Table 3.11: Numbers of Country Data Sources Contributing to the Estimation of YLD, by Region and Cause

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